LCOV - code coverage report
Current view: top level - src - semi_empirical_int_utils.F (source / functions) Hit Total Coverage
Test: CP2K Regtests (git:4dc10b3) Lines: 1190 1211 98.3 %
Date: 2024-11-21 06:45:46 Functions: 15 15 100.0 %

          Line data    Source code
       1             : !--------------------------------------------------------------------------------------------------!
       2             : !   CP2K: A general program to perform molecular dynamics simulations                              !
       3             : !   Copyright 2000-2024 CP2K developers group <https://cp2k.org>                                   !
       4             : !                                                                                                  !
       5             : !   SPDX-License-Identifier: GPL-2.0-or-later                                                      !
       6             : !--------------------------------------------------------------------------------------------------!
       7             : 
       8             : ! **************************************************************************************************
       9             : !> \brief Utilities for Integrals for semi-empiric methods
      10             : !> \author Teodoro Laino (03.2008) [tlaino] - University of Zurich
      11             : ! **************************************************************************************************
      12             : MODULE semi_empirical_int_utils
      13             : 
      14             :    USE input_constants, ONLY: do_method_pchg, &
      15             :                               do_se_IS_kdso_d
      16             :    USE kinds, ONLY: dp
      17             :    USE semi_empirical_int3_utils, ONLY: charg_int_3, &
      18             :                                         dcharg_int_3, &
      19             :                                         ijkl_low_3
      20             :    USE semi_empirical_int_arrays, ONLY: &
      21             :       CLMp, CLMxx, CLMxy, CLMyy, CLMz, CLMzp, CLMzz, clm_d, clm_sp, ijkl_ind, indexa, indexb, &
      22             :       int2c_type
      23             :    USE semi_empirical_types, ONLY: rotmat_type, &
      24             :                                    se_int_control_type, &
      25             :                                    se_int_screen_type, &
      26             :                                    se_taper_type, &
      27             :                                    semi_empirical_type
      28             : #include "./base/base_uses.f90"
      29             : 
      30             :    IMPLICIT NONE
      31             :    PRIVATE
      32             : 
      33             :    #:include 'semi_empirical_int_debug.fypp'
      34             : 
      35             :    LOGICAL, PARAMETER, PRIVATE          :: debug_this_module = .FALSE.
      36             :    CHARACTER(len=*), PARAMETER, PRIVATE :: moduleN = 'semi_empirical_int_utils'
      37             : 
      38             :    PUBLIC ::   ijkl_sp, ijkl_d, rotmat, rot_2el_2c_first, store_2el_2c_diag, &
      39             :              d_ijkl_sp, d_ijkl_d
      40             : 
      41             :    ABSTRACT INTERFACE
      42             : ! **************************************************************************************************
      43             : !> \brief ...
      44             : !> \param r ...
      45             : !> \param l1_i ...
      46             : !> \param l2_i ...
      47             : !> \param m1_i ...
      48             : !> \param m2_i ...
      49             : !> \param da_i ...
      50             : !> \param db_i ...
      51             : !> \param add0 ...
      52             : !> \param fact_screen ...
      53             : !> \return ...
      54             : ! **************************************************************************************************
      55             :       FUNCTION eval_func_sp(r, l1_i, l2_i, m1_i, m2_i, da_i, db_i, add0, fact_screen) RESULT(charg)
      56             :          USE kinds, ONLY: dp
      57             :          REAL(KIND=dp), INTENT(IN)                          :: r
      58             :          INTEGER, INTENT(IN)                                :: l1_i, l2_i, m1_i, m2_i
      59             :          REAL(KIND=dp), INTENT(IN)                          :: da_i, db_i, add0, fact_screen
      60             :          REAL(KIND=dp)                                      :: charg
      61             : 
      62             :       END FUNCTION eval_func_sp
      63             :    END INTERFACE
      64             : 
      65             :    ABSTRACT INTERFACE
      66             : ! **************************************************************************************************
      67             : !> \brief ...
      68             : !> \param r ...
      69             : !> \param l1_i ...
      70             : !> \param l2_i ...
      71             : !> \param m ...
      72             : !> \param da_i ...
      73             : !> \param db_i ...
      74             : !> \param add0 ...
      75             : !> \param fact_screen ...
      76             : !> \return ...
      77             : ! **************************************************************************************************
      78             :       FUNCTION eval_func_d(r, l1_i, l2_i, m, da_i, db_i, add0, fact_screen) RESULT(charg)
      79             :          USE kinds, ONLY: dp
      80             :          REAL(KIND=dp), INTENT(IN)                          :: r
      81             :          INTEGER, INTENT(IN)                                :: l1_i, l2_i, m
      82             :          REAL(KIND=dp), INTENT(IN)                          :: da_i, db_i, add0, fact_screen
      83             :          REAL(KIND=dp)                                      :: charg
      84             : 
      85             :       END FUNCTION eval_func_d
      86             :    END INTERFACE
      87             : 
      88             : CONTAINS
      89             : 
      90             : ! **************************************************************************************************
      91             : !> \brief General driver for computing semi-empirical integrals <ij|kl> with
      92             : !>        sp basis set. This code uses the old definitions of quadrupoles and
      93             : !>        therefore cannot be used for integrals involving d-orbitals (which
      94             : !>        require a definition of quadrupoles based on the rotational invariant
      95             : !>        property)
      96             : !>
      97             : !> \param sepi ...
      98             : !> \param sepj ...
      99             : !> \param ij ...
     100             : !> \param kl ...
     101             : !> \param li ...
     102             : !> \param lj ...
     103             : !> \param lk ...
     104             : !> \param ll ...
     105             : !> \param ic ...
     106             : !> \param r ...
     107             : !> \param se_int_control ...
     108             : !> \param se_int_screen ...
     109             : !> \param itype ...
     110             : !> \return ...
     111             : !> \date 04.2008 [tlaino]
     112             : !> \author Teodoro Laino [tlaino] - University of Zurich
     113             : ! **************************************************************************************************
     114    92397877 :    FUNCTION ijkl_sp(sepi, sepj, ij, kl, li, lj, lk, ll, ic, r, se_int_control, &
     115             :                     se_int_screen, itype) RESULT(res)
     116             :       TYPE(semi_empirical_type), POINTER                 :: sepi, sepj
     117             :       INTEGER, INTENT(IN)                                :: ij, kl, li, lj, lk, ll, ic
     118             :       REAL(KIND=dp), INTENT(IN)                          :: r
     119             :       TYPE(se_int_control_type), INTENT(IN)              :: se_int_control
     120             :       TYPE(se_int_screen_type), INTENT(IN)               :: se_int_screen
     121             :       INTEGER, INTENT(IN)                                :: itype
     122             :       REAL(KIND=dp)                                      :: res
     123             : 
     124             :       res = ijkl_sp_low(sepi, sepj, ij, kl, li, lj, lk, ll, ic, r, se_int_screen, &
     125             :                         se_int_control%integral_screening, se_int_control%shortrange, &
     126             :                         se_int_control%pc_coulomb_int, se_int_control%max_multipole, &
     127    92397877 :                         itype, charg_int_nri)
     128             : 
     129             :       ! If only the shortrange component is requested we can skip the rest
     130    92397877 :       IF ((.NOT. se_int_control%pc_coulomb_int) .AND. (itype /= do_method_pchg)) THEN
     131             :          ! Handle the 1/r^3 term, this term is ALWAYS false for KDSO-D integrals
     132    23345360 :          IF (se_int_control%shortrange .AND. se_int_control%do_ewald_r3) THEN
     133             :             res = res - ijkl_low_3(sepi, sepj, ij, kl, li, lj, lk, ll, ic, r, &
     134           0 :                                    itype, charg_int_3)
     135             :          END IF
     136             :       END IF
     137    92397877 :    END FUNCTION ijkl_sp
     138             : 
     139             : ! **************************************************************************************************
     140             : !> \brief General driver for computing derivatives of semi-empirical integrals
     141             : !>        <ij|kl> with sp basis set.
     142             : !>        This code uses the old definitions of quadrupoles and therefore
     143             : !>        cannot be used for integrals involving d-orbitals (which requires a
     144             : !>        definition of quadrupoles based on the rotational invariant property)
     145             : !>
     146             : !> \param sepi ...
     147             : !> \param sepj ...
     148             : !> \param ij ...
     149             : !> \param kl ...
     150             : !> \param li ...
     151             : !> \param lj ...
     152             : !> \param lk ...
     153             : !> \param ll ...
     154             : !> \param ic ...
     155             : !> \param r ...
     156             : !> \param se_int_control ...
     157             : !> \param se_int_screen ...
     158             : !> \param itype ...
     159             : !> \return ...
     160             : !> \date 05.2008 [tlaino]
     161             : !> \author Teodoro Laino [tlaino] - University of Zurich
     162             : ! **************************************************************************************************
     163    40138828 :    FUNCTION d_ijkl_sp(sepi, sepj, ij, kl, li, lj, lk, ll, ic, r, se_int_control, &
     164             :                       se_int_screen, itype) RESULT(res)
     165             :       TYPE(semi_empirical_type), POINTER                 :: sepi, sepj
     166             :       INTEGER, INTENT(IN)                                :: ij, kl, li, lj, lk, ll, ic
     167             :       REAL(KIND=dp), INTENT(IN)                          :: r
     168             :       TYPE(se_int_control_type), INTENT(IN)              :: se_int_control
     169             :       TYPE(se_int_screen_type), INTENT(IN)               :: se_int_screen
     170             :       INTEGER, INTENT(IN)                                :: itype
     171             :       REAL(KIND=dp)                                      :: res
     172             : 
     173             :       REAL(KIND=dp)                                      :: dfs, srd
     174             : 
     175    40138828 :       IF (se_int_control%integral_screening == do_se_IS_kdso_d) THEN
     176             :          res = ijkl_sp_low(sepi, sepj, ij, kl, li, lj, lk, ll, ic, r, se_int_screen, &
     177             :                            se_int_control%integral_screening, .FALSE., &
     178             :                            se_int_control%pc_coulomb_int, se_int_control%max_multipole, &
     179     2232298 :                            itype, dcharg_int_nri)
     180             : 
     181     2232298 :          IF (.NOT. se_int_control%pc_coulomb_int) THEN
     182             :             dfs = ijkl_sp_low(sepi, sepj, ij, kl, li, lj, lk, ll, ic, r, se_int_screen, &
     183             :                               se_int_control%integral_screening, .FALSE., .FALSE., &
     184     1662932 :                               se_int_control%max_multipole, itype, dcharg_int_nri_fs)
     185     1662932 :             res = res + dfs*se_int_screen%dft
     186             : 
     187             :             ! In case we need the shortrange part we have to evaluate an additional derivative
     188             :             ! to handle the derivative of the Tapering term
     189     1662932 :             IF (se_int_control%shortrange) THEN
     190             :                srd = ijkl_sp_low(sepi, sepj, ij, kl, li, lj, lk, ll, ic, r, se_int_screen, &
     191             :                                  se_int_control%integral_screening, .FALSE., .TRUE., &
     192     1438711 :                                  se_int_control%max_multipole, itype, dcharg_int_nri)
     193     1438711 :                res = res - srd
     194             :             END IF
     195             :          END IF
     196             :       ELSE
     197             :          res = ijkl_sp_low(sepi, sepj, ij, kl, li, lj, lk, ll, ic, r, se_int_screen, &
     198             :                            se_int_control%integral_screening, se_int_control%shortrange, &
     199             :                            se_int_control%pc_coulomb_int, se_int_control%max_multipole, &
     200    37906530 :                            itype, dcharg_int_nri)
     201             :       END IF
     202             : 
     203             :       ! If only the shortrange component is requested we can skip the rest
     204    40138828 :       IF ((.NOT. se_int_control%pc_coulomb_int) .AND. (itype /= do_method_pchg)) THEN
     205             :          ! Handle the 1/r^3 term, this term is ALWAYS false for KDSO-D integrals
     206     6310902 :          IF (se_int_control%shortrange .AND. se_int_control%do_ewald_r3) THEN
     207             :             res = res - ijkl_low_3(sepi, sepj, ij, kl, li, lj, lk, ll, ic, r, &
     208           0 :                                    itype, dcharg_int_3)
     209             :          END IF
     210             :       END IF
     211             : 
     212    40138828 :    END FUNCTION d_ijkl_sp
     213             : 
     214             : ! **************************************************************************************************
     215             : !> \brief Low level general driver for computing semi-empirical integrals
     216             : !>        <ij|kl> and their derivatives with sp basis set only.
     217             : !>        This code uses the old definitions of quadrupoles and
     218             : !>        therefore cannot be used for integrals involving d-orbitals (which
     219             : !>        require a definition of quadrupoles based on the rotational invariant
     220             : !>        property)
     221             : !>
     222             : !> \param sepi ...
     223             : !> \param sepj ...
     224             : !> \param ij ...
     225             : !> \param kl ...
     226             : !> \param li ...
     227             : !> \param lj ...
     228             : !> \param lk ...
     229             : !> \param ll ...
     230             : !> \param ic ...
     231             : !> \param r ...
     232             : !> \param se_int_screen ...
     233             : !> \param iscreen ...
     234             : !> \param shortrange ...
     235             : !> \param pc_coulomb_int ...
     236             : !> \param max_multipole ...
     237             : !> \param itype ...
     238             : !> \param eval a function without explicit interface
     239             : !> \return ...
     240             : !> \date 05.2008 [tlaino]
     241             : !> \author Teodoro Laino [tlaino] - University of Zurich
     242             : ! **************************************************************************************************
     243   135638348 :    FUNCTION ijkl_sp_low(sepi, sepj, ij, kl, li, lj, lk, ll, ic, r, se_int_screen, &
     244             :                         iscreen, shortrange, pc_coulomb_int, max_multipole, itype, eval) RESULT(res)
     245             :       TYPE(semi_empirical_type), POINTER                 :: sepi, sepj
     246             :       INTEGER, INTENT(IN)                                :: ij, kl, li, lj, lk, ll, ic
     247             :       REAL(KIND=dp), INTENT(IN)                          :: r
     248             :       TYPE(se_int_screen_type), INTENT(IN)               :: se_int_screen
     249             :       INTEGER, INTENT(IN)                                :: iscreen
     250             :       LOGICAL, INTENT(IN)                                :: shortrange, pc_coulomb_int
     251             :       INTEGER, INTENT(IN)                                :: max_multipole, itype
     252             : 
     253             :       PROCEDURE(eval_func_sp)                               :: eval
     254             :       REAL(KIND=dp)                                      :: res
     255             : 
     256             :       INTEGER                                            :: ccc, l1, l1max, l1min, l2, l2max, l2min, &
     257             :                                                             lij, lkl, lmin, m
     258             :       REAL(KIND=dp)                                      :: add, chrg, dij, dkl, fact_ij, fact_kl, &
     259             :                                                             fact_screen, pij, pkl, s1, sum
     260             : 
     261   135638348 :       l1min = ABS(li - lj)
     262   135638348 :       l1max = li + lj
     263   135638348 :       lij = indexb(li + 1, lj + 1)
     264   135638348 :       l2min = ABS(lk - ll)
     265   135638348 :       l2max = lk + ll
     266   135638348 :       lkl = indexb(lk + 1, ll + 1)
     267             : 
     268   135638348 :       l1max = MIN(l1max, 2)
     269   135638348 :       l1min = MIN(l1min, 2)
     270   135638348 :       l2max = MIN(l2max, 2)
     271   135638348 :       l2min = MIN(l2min, 2)
     272   135638348 :       sum = 0.0_dp
     273   135638348 :       dij = 0.0_dp
     274   135638348 :       dkl = 0.0_dp
     275   135638348 :       fact_ij = 1.0_dp
     276   135638348 :       fact_kl = 1.0_dp
     277   135638348 :       fact_screen = 1.0_dp
     278   135638348 :       IF (lij == 3) fact_ij = SQRT(2.0_dp)
     279   135638348 :       IF (lkl == 3) fact_kl = SQRT(2.0_dp)
     280   135638348 :       IF (.NOT. pc_coulomb_int) THEN
     281   131100151 :          IF (iscreen == do_se_IS_kdso_d) fact_screen = se_int_screen%ft
     282             :          ! Standard value of the integral
     283   320410970 :          DO l1 = l1min, l1max
     284   189310819 :             IF (l1 == 0) THEN
     285   116547484 :                IF (lij == 1) THEN
     286    87442150 :                   pij = sepi%ko(1)
     287    87442150 :                   IF (ic == -1 .OR. ic == 1) THEN
     288    59277041 :                      pij = sepi%ko(9)
     289             :                   END IF
     290    29105334 :                ELSE IF (lij == 3) THEN
     291    29105334 :                   pij = sepi%ko(7)
     292             :                END IF
     293             :             ELSE
     294    72763335 :                dij = sepi%cs(lij)*fact_ij
     295    72763335 :                pij = sepi%ko(lij)
     296             :             END IF
     297             :             !
     298   541319701 :             DO l2 = l2min, l2max
     299   220908731 :                IF (l2 == 0) THEN
     300   181954162 :                   IF (lkl == 1) THEN
     301   166155206 :                      pkl = sepj%ko(1)
     302   166155206 :                      IF (ic == -1 .OR. ic == 2) THEN
     303   133374903 :                         pkl = sepj%ko(9)
     304             :                      END IF
     305    15798956 :                   ELSE IF (lkl == 3) THEN
     306    15798956 :                      pkl = sepj%ko(7)
     307             :                   END IF
     308             :                ELSE
     309    38954569 :                   dkl = sepj%cs(lkl)*fact_kl
     310    38954569 :                   pkl = sepj%ko(lkl)
     311             :                END IF
     312   220908731 :                IF (itype == do_method_pchg) THEN
     313   140755593 :                   add = 0.0_dp
     314             :                ELSE
     315    80153138 :                   add = (pij + pkl)**2
     316             :                END IF
     317   220908731 :                lmin = MAX(l1, l2)
     318   220908731 :                s1 = 0.0_dp
     319   753976208 :                DO m = -lmin, lmin
     320   533067477 :                   ccc = clm_sp(ij, l1, m)*clm_sp(kl, l2, m)
     321   753976208 :                   IF (ABS(ccc) > EPSILON(0.0_dp)) THEN
     322   167862126 :                      chrg = eval(r, l1, l2, clm_sp(ij, l1, m), clm_sp(kl, l2, m), dij, dkl, add, fact_screen)
     323   167862126 :                      s1 = s1 + chrg
     324             :                   END IF
     325             :                END DO
     326   410219550 :                sum = sum + s1
     327             :             END DO
     328             :          END DO
     329             :          res = sum
     330             :       END IF
     331             :       ! Shortrange: Possibly computes pure Coulomb and subtract from the original integral value
     332   135638348 :       IF (shortrange .OR. pc_coulomb_int) THEN
     333     7654435 :          sum = 0.0_dp
     334     7654435 :          dij = 0.0_dp
     335     7654435 :          dkl = 0.0_dp
     336     7654435 :          add = 0.0_dp
     337     7654435 :          fact_screen = 0.0_dp
     338    20125474 :          DO l1 = l1min, l1max
     339    12471039 :             IF (l1 > max_multipole) CYCLE
     340    10115112 :             IF (l1 /= 0) THEN
     341     4993855 :                dij = sepi%cs(lij)*fact_ij
     342             :             END IF
     343             :             !
     344    34659971 :             DO l2 = l2min, l2max
     345    16890424 :                IF (l2 > max_multipole) CYCLE
     346    16890424 :                IF (l2 /= 0) THEN
     347     8352477 :                   dkl = sepj%cs(lkl)*fact_kl
     348             :                END IF
     349    16890424 :                lmin = MAX(l1, l2)
     350    16890424 :                s1 = 0.0_dp
     351    71010582 :                DO m = -lmin, lmin
     352    54120158 :                   ccc = clm_sp(ij, l1, m)*clm_sp(kl, l2, m)
     353    71010582 :                   IF (ABS(ccc) > EPSILON(0.0_dp)) THEN
     354     9755281 :                      chrg = eval(r, l1, l2, clm_sp(ij, l1, m), clm_sp(kl, l2, m), dij, dkl, add, fact_screen)
     355     9755281 :                      s1 = s1 + chrg
     356             :                   END IF
     357             :                END DO
     358    29361463 :                sum = sum + s1
     359             :             END DO
     360             :          END DO
     361     7654435 :          IF (pc_coulomb_int) res = sum
     362     7654435 :          IF (shortrange) res = res - sum
     363             :       END IF
     364   135638348 :    END FUNCTION ijkl_sp_low
     365             : 
     366             : ! **************************************************************************************************
     367             : !> \brief Interaction function between two point-charge configurations NDDO sp-code
     368             : !>        Non-Rotational Invariant definition of quadrupoles
     369             : !>        r    -  Distance r12
     370             : !>        l1,m -  Quantum numbers for multipole of configuration 1
     371             : !>        l2,m -  Quantum numbers for multipole of configuration 2
     372             : !>        da   -  charge separation of configuration 1
     373             : !>        db   -  charge separation of configuration 2
     374             : !>        add  -  additive term
     375             : !>
     376             : !> \param r ...
     377             : !> \param l1_i ...
     378             : !> \param l2_i ...
     379             : !> \param m1_i ...
     380             : !> \param m2_i ...
     381             : !> \param da_i ...
     382             : !> \param db_i ...
     383             : !> \param add0 ...
     384             : !> \param fact_screen ...
     385             : !> \return ...
     386             : !> \date 04.2008 [tlaino]
     387             : !> \author Teodoro Laino [tlaino] - University of Zurich
     388             : ! **************************************************************************************************
     389   120914157 :    FUNCTION charg_int_nri(r, l1_i, l2_i, m1_i, m2_i, da_i, db_i, add0, fact_screen) RESULT(charg)
     390             :       REAL(KIND=dp), INTENT(in)                          :: r
     391             :       INTEGER, INTENT(in)                                :: l1_i, l2_i, m1_i, m2_i
     392             :       REAL(KIND=dp), INTENT(in)                          :: da_i, db_i, add0, fact_screen
     393             :       REAL(KIND=dp)                                      :: charg
     394             : 
     395             :       INTEGER                                            :: l1, l2, m1, m2
     396             :       REAL(KIND=dp)                                      :: add, da, db, dxdx, dxqxz, dzdz, dzqxx, &
     397             :                                                             dzqzz, fact, qqxx, qqzz, qxxqxx, &
     398             :                                                             qxxqyy, qxzqxz, xyxy, zzzz
     399             : 
     400             : ! Computing only Integral Values
     401             : 
     402   120914157 :       IF (l1_i < l2_i) THEN
     403     7594517 :          l1 = l1_i
     404     7594517 :          l2 = l2_i
     405     7594517 :          m1 = m1_i
     406     7594517 :          m2 = m2_i
     407     7594517 :          da = da_i
     408     7594517 :          db = db_i
     409     7594517 :          fact = 1.0_dp
     410   113319640 :       ELSE IF (l1_i > l2_i) THEN
     411    28726373 :          l1 = l2_i
     412    28726373 :          l2 = l1_i
     413    28726373 :          m1 = m2_i
     414    28726373 :          m2 = m1_i
     415    28726373 :          da = db_i
     416    28726373 :          db = da_i
     417    28726373 :          fact = (-1.0_dp)**(l1 + l2)
     418    84593267 :       ELSE IF (l1_i == l2_i) THEN
     419    84593267 :          l1 = l1_i
     420    84593267 :          l2 = l2_i
     421    84593267 :          IF (m1_i <= m2_i) THEN
     422    84164805 :             m1 = m1_i
     423    84164805 :             m2 = m2_i
     424    84164805 :             da = da_i
     425    84164805 :             db = db_i
     426             :          ELSE
     427      428462 :             m1 = m2_i
     428      428462 :             m2 = m1_i
     429      428462 :             da = db_i
     430      428462 :             db = da_i
     431             :          END IF
     432             :          fact = 1.0_dp
     433             :       END IF
     434   120914157 :       add = add0*fact_screen
     435   120914157 :       charg = 0.0_dp
     436             :       ! Q - Q.
     437   120914157 :       IF (l1 == 0 .AND. l2 == 0) THEN
     438    80737109 :          charg = fact/SQRT(r**2 + add)
     439    80737109 :          RETURN
     440             :       END IF
     441             :       ! Q - Z.
     442    40177048 :       IF (l1 == 0 .AND. l2 == 1 .AND. m2 == CLMz) THEN
     443    10964398 :          charg = 1.0_dp/SQRT((r + db)**2 + add) - 1.0_dp/SQRT((r - db)**2 + add)
     444    10964398 :          charg = charg*0.5_dp*fact
     445    10964398 :          RETURN
     446             :       END IF
     447             :       ! Z - Z.
     448    29212650 :       IF (l1 == 1 .AND. l2 == 1 .AND. m1 == CLMz .AND. m2 == CLMz) THEN
     449             :          dzdz = &
     450             :             +1.0_dp/SQRT((r + da - db)**2 + add) + 1.0_dp/SQRT((r - da + db)**2 + add) &
     451      428462 :             - 1.0_dp/SQRT((r - da - db)**2 + add) - 1.0_dp/SQRT((r + da + db)**2 + add)
     452      428462 :          charg = dzdz*0.25_dp*fact
     453      428462 :          RETURN
     454             :       END IF
     455             :       ! X - X
     456    28784188 :       IF (l1 == 1 .AND. l2 == 1 .AND. m1 == CLMp .AND. m2 == CLMp) THEN
     457      428462 :          dxdx = 2.0_dp/SQRT(r**2 + (da - db)**2 + add) - 2.0_dp/SQRT(r**2 + (da + db)**2 + add)
     458      428462 :          charg = dxdx*0.25_dp*fact
     459      428462 :          RETURN
     460             :       END IF
     461             :       ! Q - ZZ
     462    28355726 :       IF (l1 == 0 .AND. l2 == 2 .AND. m2 == CLMzz) THEN
     463    10964398 :          qqzz = 1.0_dp/SQRT((r - db)**2 + add) - 2.0_dp/SQRT(r**2 + add) + 1.0_dp/SQRT((r + db)**2 + add)
     464    10964398 :          charg = qqzz*0.25_dp*fact
     465    10964398 :          RETURN
     466             :       END IF
     467             :       ! Q - XX
     468    17391328 :       IF (l1 == 0 .AND. l2 == 2 .AND. (m2 == CLMyy .OR. m2 == CLMxx)) THEN
     469    11821322 :          qqxx = -1.0_dp/SQRT(r**2 + add) + 1.0_dp/SQRT(r**2 + add + db**2)
     470    11821322 :          charg = qqxx*0.5_dp*fact
     471    11821322 :          RETURN
     472             :       END IF
     473             :       ! Z - ZZ
     474     5570006 :       IF (l1 == 1 .AND. l2 == 2 .AND. m1 == CLMz .AND. m2 == CLMzz) THEN
     475             :          dzqzz = &
     476             :             +1.0_dp/SQRT((r - da - db)**2 + add) - 2.0_dp/SQRT((r - da)**2 + add) &
     477             :             + 1.0_dp/SQRT((r - da + db)**2 + add) - 1.0_dp/SQRT((r + da - db)**2 + add) &
     478      856924 :             + 2.0_dp/SQRT((r + da)**2 + add) - 1.0_dp/SQRT((r + da + db)**2 + add)
     479      856924 :          charg = dzqzz*0.125_dp*fact
     480      856924 :          RETURN
     481             :       END IF
     482             :       ! Z - XX
     483     4713082 :       IF (l1 == 1 .AND. l2 == 2 .AND. m1 == CLMz .AND. (m2 == CLMyy .OR. m2 == CLMxx)) THEN
     484             :          dzqxx = &
     485             :             +1.0_dp/SQRT((r + da)**2 + add) - 1.0_dp/SQRT((r + da)**2 + add + db**2) &
     486      856924 :             - 1.0_dp/SQRT((r - da)**2 + add) + 1.0_dp/SQRT((r - da)**2 + add + db**2)
     487      856924 :          charg = dzqxx*0.25_dp*fact
     488      856924 :          RETURN
     489             :       END IF
     490             :       ! ZZ - ZZ
     491     3856158 :       IF (l1 == 2 .AND. l2 == 2 .AND. m1 == CLMzz .AND. m2 == CLMzz) THEN
     492             :          zzzz = &
     493             :             +1.0_dp/SQRT((r - da - db)**2 + add) + 1.0_dp/SQRT((r + da + db)**2 + add) &
     494      428462 :             + 1.0_dp/SQRT((r - da + db)**2 + add) + 1.0_dp/SQRT((r + da - db)**2 + add)
     495             :          xyxy = &
     496             :             +1.0_dp/SQRT((r - da)**2 + add) + 1.0_dp/SQRT((r + da)**2 + add) &
     497             :             + 1.0_dp/SQRT((r - db)**2 + add) + 1.0_dp/SQRT((r + db)**2 + add) &
     498      428462 :             - 2.0_dp/SQRT(r**2 + add)
     499      428462 :          charg = (zzzz*0.0625_dp - xyxy*0.125_dp)*fact
     500      428462 :          RETURN
     501             :       END IF
     502             :       ! ZZ - XX
     503     3427696 :       IF (l1 == 2 .AND. l2 == 2 .AND. m1 == CLMzz .AND. (m2 == CLMxx .OR. m2 == CLMyy)) THEN
     504             :          zzzz = &
     505             :             -1.0_dp/SQRT((r + da)**2 + add) + 1.0_dp/SQRT((r + da)**2 + db**2 + add) &
     506      856924 :             - 1.0_dp/SQRT((r - da)**2 + add) + 1.0_dp/SQRT((r - da)**2 + db**2 + add)
     507             :          xyxy = &
     508      856924 :             +1.0_dp/SQRT(r**2 + db**2 + add) - 1.0_dp/SQRT(r**2 + add)
     509      856924 :          charg = (zzzz*0.125_dp - xyxy*0.25_dp)*fact
     510      856924 :          RETURN
     511             :       END IF
     512             :       ! X - ZX
     513     2570772 :       IF (l1 == 1 .AND. l2 == 2 .AND. m1 == CLMp .AND. m2 == CLMzp) THEN
     514      856924 :          db = db/2.0_dp
     515             :          dxqxz = &
     516             :             -1.0_dp/SQRT((r - db)**2 + (da - db)**2 + add) + 1.0_dp/SQRT((r + db)**2 + (da - db)**2 + add) &
     517      856924 :             + 1.0_dp/SQRT((r - db)**2 + (da + db)**2 + add) - 1.0_dp/SQRT((r + db)**2 + (da + db)**2 + add)
     518      856924 :          charg = dxqxz*0.25_dp*fact
     519      856924 :          RETURN
     520             :       END IF
     521             :       ! ZX - ZX
     522     1713848 :       IF (l1 == 2 .AND. l2 == 2 .AND. m1 == CLMzp .AND. m2 == CLMzp) THEN
     523      428462 :          da = da/2.0_dp
     524      428462 :          db = db/2.0_dp
     525             :          qxzqxz = &
     526             :             +1.0_dp/SQRT((r + da - db)**2 + (da - db)**2 + add) - 1.0_dp/SQRT((r + da + db)**2 + (da - db)**2 + add) &
     527             :             - 1.0_dp/SQRT((r - da - db)**2 + (da - db)**2 + add) + 1.0_dp/SQRT((r - da + db)**2 + (da - db)**2 + add) &
     528             :             - 1.0_dp/SQRT((r + da - db)**2 + (da + db)**2 + add) + 1.0_dp/SQRT((r + da + db)**2 + (da + db)**2 + add) &
     529      428462 :             + 1.0_dp/SQRT((r - da - db)**2 + (da + db)**2 + add) - 1.0_dp/SQRT((r - da + db)**2 + (da + db)**2 + add)
     530      428462 :          charg = qxzqxz*0.125_dp*fact
     531      428462 :          RETURN
     532             :       END IF
     533             :       ! XX - XX
     534     1285386 :       IF (l1 == 2 .AND. l2 == 2 .AND. (((m1 == CLMyy) .AND. (m2 == CLMyy)) .OR. ((m1 == CLMxx) .AND. (m2 == CLMxx)))) THEN
     535             :          qxxqxx = &
     536             :             +2.0_dp/SQRT(r**2 + add) + 1.0_dp/SQRT(r**2 + (da - db)**2 + add) &
     537             :             + 1.0_dp/SQRT(r**2 + (da + db)**2 + add) - 2.0_dp/SQRT(r**2 + da**2 + add) &
     538      428462 :             - 2.0_dp/SQRT(r**2 + db**2 + add)
     539      428462 :          charg = qxxqxx*0.125_dp*fact
     540      428462 :          RETURN
     541             :       END IF
     542             :       ! XX - YY
     543      856924 :       IF (l1 == 2 .AND. l2 == 2 .AND. m1 == CLMyy .AND. m2 == CLMxx) THEN
     544             :          qxxqyy = &
     545             :             +1.0_dp/SQRT(r**2 + add) - 1.0_dp/SQRT(r**2 + da**2 + add) &
     546      428462 :             - 1.0_dp/SQRT(r**2 + db**2 + add) + 1.0_dp/SQRT(r**2 + da**2 + db**2 + add)
     547      428462 :          charg = qxxqyy*0.25_dp*fact
     548      428462 :          RETURN
     549             :       END IF
     550             :       ! XY - XY
     551      428462 :       IF (l1 == 2 .AND. l2 == 2 .AND. m1 == CLMxy .AND. m2 == CLMxy) THEN
     552             :          qxxqxx = &
     553             :             +2.0_dp/SQRT(r**2 + add) + 1.0_dp/SQRT(r**2 + (da - db)**2 + add) &
     554             :             + 1.0_dp/SQRT(r**2 + (da + db)**2 + add) - 2.0_dp/SQRT(r**2 + da**2 + add) &
     555      428462 :             - 2.0_dp/SQRT(r**2 + db**2 + add)
     556             :          qxxqyy = &
     557             :             +1.0_dp/SQRT(r**2 + add) - 1.0_dp/SQRT(r**2 + da**2 + add) &
     558      428462 :             - 1.0_dp/SQRT(r**2 + db**2 + add) + 1.0_dp/SQRT(r**2 + da**2 + db**2 + add)
     559      428462 :          charg = 0.5_dp*(qxxqxx*0.125_dp - qxxqyy*0.25_dp)*fact
     560      428462 :          RETURN
     561             :       END IF
     562             :       ! We should NEVER reach this point
     563           0 :       CPABORT("")
     564           0 :    END FUNCTION charg_int_nri
     565             : 
     566             : ! **************************************************************************************************
     567             : !> \brief Derivatives of interaction function between two point-charge
     568             : !>        configurations NDDO sp-code.
     569             : !>        Non-Rotational Invariant definition of quadrupoles
     570             : !>
     571             : !>        r    -  Distance r12
     572             : !>        l1,m -  Quantum numbers for multipole of configuration 1
     573             : !>        l2,m -  Quantum numbers for multipole of configuration 2
     574             : !>        da   -  charge separation of configuration 1
     575             : !>        db   -  charge separation of configuration 2
     576             : !>        add  -  additive term
     577             : !>
     578             : !> \param r ...
     579             : !> \param l1_i ...
     580             : !> \param l2_i ...
     581             : !> \param m1_i ...
     582             : !> \param m2_i ...
     583             : !> \param da_i ...
     584             : !> \param db_i ...
     585             : !> \param add0 ...
     586             : !> \param fact_screen ...
     587             : !> \return ...
     588             : !> \date 04.2008 [tlaino]
     589             : !> \author Teodoro Laino [tlaino] - University of Zurich
     590             : ! **************************************************************************************************
     591    53899489 :    FUNCTION dcharg_int_nri(r, l1_i, l2_i, m1_i, m2_i, da_i, db_i, add0, fact_screen) RESULT(charg)
     592             :       REAL(KIND=dp), INTENT(in)                          :: r
     593             :       INTEGER, INTENT(in)                                :: l1_i, l2_i, m1_i, m2_i
     594             :       REAL(KIND=dp), INTENT(in)                          :: da_i, db_i, add0, fact_screen
     595             :       REAL(KIND=dp)                                      :: charg
     596             : 
     597             :       INTEGER                                            :: l1, l2, m1, m2
     598             :       REAL(KIND=dp)                                      :: add, da, db, dxdx, dxqxz, dzdz, dzqxx, &
     599             :                                                             dzqzz, fact, qqxx, qqzz, qxxqxx, &
     600             :                                                             qxxqyy, qxzqxz, xyxy, zzzz
     601             : 
     602             : ! Computing only Integral Derivatives
     603             : 
     604    53899489 :       IF (l1_i < l2_i) THEN
     605     3385714 :          l1 = l1_i
     606     3385714 :          l2 = l2_i
     607     3385714 :          m1 = m1_i
     608     3385714 :          m2 = m2_i
     609     3385714 :          da = da_i
     610     3385714 :          db = db_i
     611     3385714 :          fact = 1.0_dp
     612    50513775 :       ELSE IF (l1_i > l2_i) THEN
     613    13898398 :          l1 = l2_i
     614    13898398 :          l2 = l1_i
     615    13898398 :          m1 = m2_i
     616    13898398 :          m2 = m1_i
     617    13898398 :          da = db_i
     618    13898398 :          db = da_i
     619    13898398 :          fact = (-1.0_dp)**(l1 + l2)
     620    36615377 :       ELSE IF (l1_i == l2_i) THEN
     621    36615377 :          l1 = l1_i
     622    36615377 :          l2 = l2_i
     623    36615377 :          IF (m1_i <= m2_i) THEN
     624    36422710 :             m1 = m1_i
     625    36422710 :             m2 = m2_i
     626    36422710 :             da = da_i
     627    36422710 :             db = db_i
     628             :          ELSE
     629      192667 :             m1 = m2_i
     630      192667 :             m2 = m1_i
     631      192667 :             da = db_i
     632      192667 :             db = da_i
     633             :          END IF
     634             :          fact = 1.0_dp
     635             :       END IF
     636    53899489 :       charg = 0.0_dp
     637    53899489 :       add = add0*fact_screen
     638             :       ! Q - Q.
     639    53899489 :       IF (l1 == 0 .AND. l2 == 0) THEN
     640    34881374 :          charg = r/SQRT(r**2 + add)**3
     641    34881374 :          charg = -charg*fact
     642    34881374 :          RETURN
     643             :       END IF
     644             :       ! Q - Z.
     645    19018115 :       IF (l1 == 0 .AND. l2 == 1 .AND. m2 == CLMz) THEN
     646     5247592 :          charg = (r + db)/SQRT((r + db)**2 + add)**3 - (r - db)/SQRT((r - db)**2 + add)**3
     647     5247592 :          charg = -charg*0.5_dp*fact
     648     5247592 :          RETURN
     649             :       END IF
     650             :       ! Z - Z.
     651    13770523 :       IF (l1 == 1 .AND. l2 == 1 .AND. m1 == CLMz .AND. m2 == CLMz) THEN
     652             :          dzdz = &
     653             :             +(r + da - db)/SQRT((r + da - db)**2 + add)**3 + (r - da + db)/SQRT((r - da + db)**2 + add)**3 &
     654      192667 :             - (r - da - db)/SQRT((r - da - db)**2 + add)**3 - (r + da + db)/SQRT((r + da + db)**2 + add)**3
     655      192667 :          charg = -dzdz*0.25_dp*fact
     656      192667 :          RETURN
     657             :       END IF
     658             :       ! X - X
     659    13577856 :       IF (l1 == 1 .AND. l2 == 1 .AND. m1 == CLMp .AND. m2 == CLMp) THEN
     660      192667 :          dxdx = 2.0_dp*r/SQRT(r**2 + (da - db)**2 + add)**3 - 2.0_dp*r/SQRT(r**2 + (da + db)**2 + add)**3
     661      192667 :          charg = -dxdx*0.25_dp*fact
     662      192667 :          RETURN
     663             :       END IF
     664             :       ! Q - ZZ
     665    13385189 :       IF (l1 == 0 .AND. l2 == 2 .AND. m2 == CLMzz) THEN
     666     5247592 :          qqzz = (r - db)/SQRT((r - db)**2 + add)**3 - 2.0_dp*r/SQRT(r**2 + add)**3 + (r + db)/SQRT((r + db)**2 + add)**3
     667     5247592 :          charg = -qqzz*0.25_dp*fact
     668     5247592 :          RETURN
     669             :       END IF
     670             :       ! Q - XX
     671     8137597 :       IF (l1 == 0 .AND. l2 == 2 .AND. (m2 == CLMyy .OR. m2 == CLMxx)) THEN
     672     5632926 :          qqxx = -r/SQRT(r**2 + add)**3 + r/SQRT(r**2 + add + db**2)**3
     673     5632926 :          charg = -qqxx*0.5_dp*fact
     674     5632926 :          RETURN
     675             :       END IF
     676             :       ! Z - ZZ
     677     2504671 :       IF (l1 == 1 .AND. l2 == 2 .AND. m1 == CLMz .AND. m2 == CLMzz) THEN
     678             :          dzqzz = &
     679             :             +(r - da - db)/SQRT((r - da - db)**2 + add)**3 - 2.0_dp*(r - da)/SQRT((r - da)**2 + add)**3 &
     680             :             + (r - da + db)/SQRT((r - da + db)**2 + add)**3 - (r + da - db)/SQRT((r + da - db)**2 + add)**3 &
     681      385334 :             + 2.0_dp*(r + da)/SQRT((r + da)**2 + add)**3 - (r + da + db)/SQRT((r + da + db)**2 + add)**3
     682      385334 :          charg = -dzqzz*0.125_dp*fact
     683      385334 :          RETURN
     684             :       END IF
     685             :       ! Z - XX
     686     2119337 :       IF (l1 == 1 .AND. l2 == 2 .AND. m1 == CLMz .AND. (m2 == CLMyy .OR. m2 == CLMxx)) THEN
     687             :          dzqxx = &
     688             :             +(r + da)/SQRT((r + da)**2 + add)**3 - (r + da)/SQRT((r + da)**2 + add + db**2)**3 &
     689      385334 :             - (r - da)/SQRT((r - da)**2 + add)**3 + (r - da)/SQRT((r - da)**2 + add + db**2)**3
     690      385334 :          charg = -dzqxx*0.25_dp*fact
     691      385334 :          RETURN
     692             :       END IF
     693             :       ! ZZ - ZZ
     694     1734003 :       IF (l1 == 2 .AND. l2 == 2 .AND. m1 == CLMzz .AND. m2 == CLMzz) THEN
     695             :          zzzz = &
     696             :             +(r - da - db)/SQRT((r - da - db)**2 + add)**3 + (r + da + db)/SQRT((r + da + db)**2 + add)**3 &
     697      192667 :             + (r - da + db)/SQRT((r - da + db)**2 + add)**3 + (r + da - db)/SQRT((r + da - db)**2 + add)**3
     698             :          xyxy = &
     699             :             +(r - da)/SQRT((r - da)**2 + add)**3 + (r + da)/SQRT((r + da)**2 + add)**3 &
     700             :             + (r - db)/SQRT((r - db)**2 + add)**3 + (r + db)/SQRT((r + db)**2 + add)**3 &
     701      192667 :             - 2.0_dp*r/SQRT(r**2 + add)**3
     702      192667 :          charg = -(zzzz*0.0625_dp - xyxy*0.125_dp)*fact
     703      192667 :          RETURN
     704             :       END IF
     705             :       ! ZZ - XX
     706     1541336 :       IF (l1 == 2 .AND. l2 == 2 .AND. m1 == CLMzz .AND. (m2 == CLMxx .OR. m2 == CLMyy)) THEN
     707             :          zzzz = &
     708             :             -(r + da)/SQRT((r + da)**2 + add)**3 + (r + da)/SQRT((r + da)**2 + db**2 + add)**3 &
     709      385334 :             - (r - da)/SQRT((r - da)**2 + add)**3 + (r - da)/SQRT((r - da)**2 + db**2 + add)**3
     710      385334 :          xyxy = r/SQRT(r**2 + db**2 + add)**3 - r/SQRT(r**2 + add)**3
     711      385334 :          charg = -(zzzz*0.125_dp - xyxy*0.25_dp)*fact
     712      385334 :          RETURN
     713             :       END IF
     714             :       ! X - ZX
     715     1156002 :       IF (l1 == 1 .AND. l2 == 2 .AND. m1 == CLMp .AND. m2 == CLMzp) THEN
     716      385334 :          db = db/2.0_dp
     717             :          dxqxz = &
     718             :             -(r - db)/SQRT((r - db)**2 + (da - db)**2 + add)**3 + (r + db)/SQRT((r + db)**2 + (da - db)**2 + add)**3 &
     719      385334 :             + (r - db)/SQRT((r - db)**2 + (da + db)**2 + add)**3 - (r + db)/SQRT((r + db)**2 + (da + db)**2 + add)**3
     720      385334 :          charg = -dxqxz*0.25_dp*fact
     721      385334 :          RETURN
     722             :       END IF
     723             :       ! ZX - ZX
     724      770668 :       IF (l1 == 2 .AND. l2 == 2 .AND. m1 == CLMzp .AND. m2 == CLMzp) THEN
     725      192667 :          da = da/2.0_dp
     726      192667 :          db = db/2.0_dp
     727             :          qxzqxz = &
     728             :       +(r + da - db)/SQRT((r + da - db)**2 + (da - db)**2 + add)**3 - (r + da + db)/SQRT((r + da + db)**2 + (da - db)**2 + add)**3 &
     729             :      - (r - da - db)/SQRT((r - da - db)**2 + (da - db)**2 + add)**3 + (r - da + db)/SQRT((r - da + db)**2 + (da - db)**2 + add)**3 &
     730             :      - (r + da - db)/SQRT((r + da - db)**2 + (da + db)**2 + add)**3 + (r + da + db)/SQRT((r + da + db)**2 + (da + db)**2 + add)**3 &
     731      192667 :        + (r - da - db)/SQRT((r - da - db)**2 + (da + db)**2 + add)**3 - (r - da + db)/SQRT((r - da + db)**2 + (da + db)**2 + add)**3
     732      192667 :          charg = -qxzqxz*0.125_dp*fact
     733      192667 :          RETURN
     734             :       END IF
     735             :       ! XX - XX
     736      578001 :       IF (l1 == 2 .AND. l2 == 2 .AND. (((m1 == CLMyy) .AND. (m2 == CLMyy)) .OR. ((m1 == CLMxx) .AND. (m2 == CLMxx)))) THEN
     737             :          qxxqxx = &
     738             :             +2.0_dp*r/SQRT(r**2 + add)**3 + r/SQRT(r**2 + (da - db)**2 + add)**3 &
     739             :             + r/SQRT(r**2 + (da + db)**2 + add)**3 - 2.0_dp*r/SQRT(r**2 + da**2 + add)**3 &
     740      192667 :             - 2.0_dp*r/SQRT(r**2 + db**2 + add)**3
     741      192667 :          charg = -qxxqxx*0.125_dp*fact
     742      192667 :          RETURN
     743             :       END IF
     744             :       ! XX - YY
     745      385334 :       IF (l1 == 2 .AND. l2 == 2 .AND. m1 == CLMyy .AND. m2 == CLMxx) THEN
     746             :          qxxqyy = &
     747             :             +r/SQRT(r**2 + add)**3 - r/SQRT(r**2 + da**2 + add)**3 &
     748      192667 :             - r/SQRT(r**2 + db**2 + add)**3 + r/SQRT(r**2 + da**2 + db**2 + add)**3
     749      192667 :          charg = -qxxqyy*0.25_dp*fact
     750      192667 :          RETURN
     751             :       END IF
     752             :       ! XY - XY
     753      192667 :       IF (l1 == 2 .AND. l2 == 2 .AND. m1 == CLMxy .AND. m2 == CLMxy) THEN
     754             :          qxxqxx = &
     755             :             +2.0_dp*r/SQRT(r**2 + add)**3 + r/SQRT(r**2 + (da - db)**2 + add)**3 &
     756             :             + r/SQRT(r**2 + (da + db)**2 + add)**3 - 2.0_dp*r/SQRT(r**2 + da**2 + add)**3 &
     757      192667 :             - 2.0_dp*r/SQRT(r**2 + db**2 + add)**3
     758             :          qxxqyy = &
     759             :             +r/SQRT(r**2 + add)**3 - r/SQRT(r**2 + da**2 + add)**3 &
     760      192667 :             - r/SQRT(r**2 + db**2 + add)**3 + r/SQRT(r**2 + da**2 + db**2 + add)**3
     761      192667 :          charg = -0.5_dp*(qxxqxx*0.125_dp - qxxqyy*0.25_dp)*fact
     762      192667 :          RETURN
     763             :       END IF
     764             :       ! We should NEVER reach this point
     765           0 :       CPABORT("")
     766           0 :    END FUNCTION dcharg_int_nri
     767             : 
     768             : ! **************************************************************************************************
     769             : !> \brief Derivatives of interaction function between two point-charge
     770             : !>        configurations NDDO sp-code. The derivative takes care of the screening
     771             : !>        term only.
     772             : !>        Non-Rotational Invariant definition of quadrupoles
     773             : !>
     774             : !>        r    -  Distance r12
     775             : !>        l1,m -  Quantum numbers for multipole of configuration 1
     776             : !>        l2,m -  Quantum numbers for multipole of configuration 2
     777             : !>        da   -  charge separation of configuration 1
     778             : !>        db   -  charge separation of configuration 2
     779             : !>        add  -  additive term
     780             : !>
     781             : !> \param r ...
     782             : !> \param l1_i ...
     783             : !> \param l2_i ...
     784             : !> \param m1_i ...
     785             : !> \param m2_i ...
     786             : !> \param da_i ...
     787             : !> \param db_i ...
     788             : !> \param add0 ...
     789             : !> \param fact_screen ...
     790             : !> \return ...
     791             : !> \date 04.2008 [tlaino]
     792             : !> \author Teodoro Laino [tlaino] - University of Zurich
     793             : ! **************************************************************************************************
     794     2803761 :    FUNCTION dcharg_int_nri_fs(r, l1_i, l2_i, m1_i, m2_i, da_i, db_i, add0, fact_screen) RESULT(charg)
     795             :       REAL(KIND=dp), INTENT(in)                          :: r
     796             :       INTEGER, INTENT(in)                                :: l1_i, l2_i, m1_i, m2_i
     797             :       REAL(KIND=dp), INTENT(in)                          :: da_i, db_i, add0, fact_screen
     798             :       REAL(KIND=dp)                                      :: charg
     799             : 
     800             :       INTEGER                                            :: l1, l2, m1, m2
     801             :       REAL(KIND=dp)                                      :: add, da, db, dxdx, dxqxz, dzdz, dzqxx, &
     802             :                                                             dzqzz, fact, qqxx, qqzz, qxxqxx, &
     803             :                                                             qxxqyy, qxzqxz, xyxy, zzzz
     804             : 
     805             : ! Computing only Integral Derivatives
     806             : 
     807     2803761 :       IF (l1_i < l2_i) THEN
     808      653103 :          l1 = l1_i
     809      653103 :          l2 = l2_i
     810      653103 :          m1 = m1_i
     811      653103 :          m2 = m2_i
     812      653103 :          da = da_i
     813      653103 :          db = db_i
     814      653103 :          fact = 1.0_dp
     815     2150658 :       ELSE IF (l1_i > l2_i) THEN
     816      732123 :          l1 = l2_i
     817      732123 :          l2 = l1_i
     818      732123 :          m1 = m2_i
     819      732123 :          m2 = m1_i
     820      732123 :          da = db_i
     821      732123 :          db = da_i
     822      732123 :          fact = (-1.0_dp)**(l1 + l2)
     823     1418535 :       ELSE IF (l1_i == l2_i) THEN
     824     1418535 :          l1 = l1_i
     825     1418535 :          l2 = l2_i
     826     1418535 :          IF (m1_i <= m2_i) THEN
     827     1380180 :             m1 = m1_i
     828     1380180 :             m2 = m2_i
     829     1380180 :             da = da_i
     830     1380180 :             db = db_i
     831             :          ELSE
     832       38355 :             m1 = m2_i
     833       38355 :             m2 = m1_i
     834       38355 :             da = db_i
     835       38355 :             db = da_i
     836             :          END IF
     837             :          fact = 1.0_dp
     838             :       END IF
     839     2803761 :       charg = 0.0_dp
     840     2803761 :       add = add0*fact_screen
     841             :       ! The 0.5 factor handles the derivative of the SQRT
     842     2803761 :       fact = fact*0.5_dp
     843             :       ! Q - Q.
     844     2803761 :       IF (l1 == 0 .AND. l2 == 0) THEN
     845     1073340 :          charg = add0/SQRT(r**2 + add)**3
     846     1073340 :          charg = -charg*fact
     847     1073340 :          RETURN
     848             :       END IF
     849             :       ! Q - Z.
     850     1730421 :       IF (l1 == 0 .AND. l2 == 1 .AND. m2 == CLMz) THEN
     851      359462 :          charg = add0/SQRT((r + db)**2 + add)**3 - add0/SQRT((r - db)**2 + add)**3
     852      359462 :          charg = -charg*0.5_dp*fact
     853      359462 :          RETURN
     854             :       END IF
     855             :       ! Z - Z.
     856     1370959 :       IF (l1 == 1 .AND. l2 == 1 .AND. m1 == CLMz .AND. m2 == CLMz) THEN
     857             :          dzdz = &
     858             :             +add0/SQRT((r + da - db)**2 + add)**3 + add0/SQRT((r - da + db)**2 + add)**3 &
     859       38355 :             - add0/SQRT((r - da - db)**2 + add)**3 - add0/SQRT((r + da + db)**2 + add)**3
     860       38355 :          charg = -dzdz*0.25_dp*fact
     861       38355 :          RETURN
     862             :       END IF
     863             :       ! X - X
     864     1332604 :       IF (l1 == 1 .AND. l2 == 1 .AND. m1 == CLMp .AND. m2 == CLMp) THEN
     865       38355 :          dxdx = 2.0_dp*add0/SQRT(r**2 + (da - db)**2 + add)**3 - 2.0_dp*add0/SQRT(r**2 + (da + db)**2 + add)**3
     866       38355 :          charg = -dxdx*0.25_dp*fact
     867       38355 :          RETURN
     868             :       END IF
     869             :       ! Q - ZZ
     870     1294249 :       IF (l1 == 0 .AND. l2 == 2 .AND. m2 == CLMzz) THEN
     871      359462 :          qqzz = add0/SQRT((r - db)**2 + add)**3 - 2.0_dp*add0/SQRT(r**2 + add)**3 + add0/SQRT((r + db)**2 + add)**3
     872      359462 :          charg = -qqzz*0.25_dp*fact
     873      359462 :          RETURN
     874             :       END IF
     875             :       ! Q - XX
     876      934787 :       IF (l1 == 0 .AND. l2 == 2 .AND. (m2 == CLMyy .OR. m2 == CLMxx)) THEN
     877      436172 :          qqxx = -add0/SQRT(r**2 + add)**3 + add0/SQRT(r**2 + add + db**2)**3
     878      436172 :          charg = -qqxx*0.5_dp*fact
     879      436172 :          RETURN
     880             :       END IF
     881             :       ! Z - ZZ
     882      498615 :       IF (l1 == 1 .AND. l2 == 2 .AND. m1 == CLMz .AND. m2 == CLMzz) THEN
     883             :          dzqzz = &
     884             :             +add0/SQRT((r - da - db)**2 + add)**3 - 2.0_dp*add0/SQRT((r - da)**2 + add)**3 &
     885             :             + add0/SQRT((r - da + db)**2 + add)**3 - add0/SQRT((r + da - db)**2 + add)**3 &
     886       76710 :             + 2.0_dp*add0/SQRT((r + da)**2 + add)**3 - add0/SQRT((r + da + db)**2 + add)**3
     887       76710 :          charg = -dzqzz*0.125_dp*fact
     888       76710 :          RETURN
     889             :       END IF
     890             :       ! Z - XX
     891      421905 :       IF (l1 == 1 .AND. l2 == 2 .AND. m1 == CLMz .AND. (m2 == CLMyy .OR. m2 == CLMxx)) THEN
     892             :          dzqxx = &
     893             :             +add0/SQRT((r + da)**2 + add)**3 - add0/SQRT((r + da)**2 + add + db**2)**3 &
     894       76710 :             - add0/SQRT((r - da)**2 + add)**3 + add0/SQRT((r - da)**2 + add + db**2)**3
     895       76710 :          charg = -dzqxx*0.25_dp*fact
     896       76710 :          RETURN
     897             :       END IF
     898             :       ! ZZ - ZZ
     899      345195 :       IF (l1 == 2 .AND. l2 == 2 .AND. m1 == CLMzz .AND. m2 == CLMzz) THEN
     900             :          zzzz = &
     901             :             +add0/SQRT((r - da - db)**2 + add)**3 + add0/SQRT((r + da + db)**2 + add)**3 &
     902       38355 :             + add0/SQRT((r - da + db)**2 + add)**3 + add0/SQRT((r + da - db)**2 + add)**3
     903             :          xyxy = &
     904             :             +add0/SQRT((r - da)**2 + add)**3 + add0/SQRT((r + da)**2 + add)**3 &
     905             :             + add0/SQRT((r - db)**2 + add)**3 + add0/SQRT((r + db)**2 + add)**3 &
     906       38355 :             - 2.0_dp*add0/SQRT(r**2 + add)**3
     907       38355 :          charg = -(zzzz*0.0625_dp - xyxy*0.125_dp)*fact
     908       38355 :          RETURN
     909             :       END IF
     910             :       ! ZZ - XX
     911      306840 :       IF (l1 == 2 .AND. l2 == 2 .AND. m1 == CLMzz .AND. (m2 == CLMxx .OR. m2 == CLMyy)) THEN
     912             :          zzzz = &
     913             :             -add0/SQRT((r + da)**2 + add)**3 + add0/SQRT((r + da)**2 + db**2 + add)**3 &
     914       76710 :             - add0/SQRT((r - da)**2 + add)**3 + add0/SQRT((r - da)**2 + db**2 + add)**3
     915       76710 :          xyxy = add0/SQRT(r**2 + db**2 + add)**3 - add0/SQRT(r**2 + add)**3
     916       76710 :          charg = -(zzzz*0.125_dp - xyxy*0.25_dp)*fact
     917       76710 :          RETURN
     918             :       END IF
     919             :       ! X - ZX
     920      230130 :       IF (l1 == 1 .AND. l2 == 2 .AND. m1 == CLMp .AND. m2 == CLMzp) THEN
     921       76710 :          db = db/2.0_dp
     922             :          dxqxz = &
     923             :             -add0/SQRT((r - db)**2 + (da - db)**2 + add)**3 + add0/SQRT((r + db)**2 + (da - db)**2 + add)**3 &
     924       76710 :             + add0/SQRT((r - db)**2 + (da + db)**2 + add)**3 - add0/SQRT((r + db)**2 + (da + db)**2 + add)**3
     925       76710 :          charg = -dxqxz*0.25_dp*fact
     926       76710 :          RETURN
     927             :       END IF
     928             :       ! ZX - ZX
     929      153420 :       IF (l1 == 2 .AND. l2 == 2 .AND. m1 == CLMzp .AND. m2 == CLMzp) THEN
     930       38355 :          da = da/2.0_dp
     931       38355 :          db = db/2.0_dp
     932             :          qxzqxz = &
     933             :             +add0/SQRT((r + da - db)**2 + (da - db)**2 + add)**3 - add0/SQRT((r + da + db)**2 + (da - db)**2 + add)**3 &
     934             :             - add0/SQRT((r - da - db)**2 + (da - db)**2 + add)**3 + add0/SQRT((r - da + db)**2 + (da - db)**2 + add)**3 &
     935             :             - add0/SQRT((r + da - db)**2 + (da + db)**2 + add)**3 + add0/SQRT((r + da + db)**2 + (da + db)**2 + add)**3 &
     936       38355 :             + add0/SQRT((r - da - db)**2 + (da + db)**2 + add)**3 - add0/SQRT((r - da + db)**2 + (da + db)**2 + add)**3
     937       38355 :          charg = -qxzqxz*0.125_dp*fact
     938       38355 :          RETURN
     939             :       END IF
     940             :       ! XX - XX
     941      115065 :       IF (l1 == 2 .AND. l2 == 2 .AND. (((m1 == CLMyy) .AND. (m2 == CLMyy)) .OR. ((m1 == CLMxx) .AND. (m2 == CLMxx)))) THEN
     942             :          qxxqxx = &
     943             :             +2.0_dp*add0/SQRT(r**2 + add)**3 + add0/SQRT(r**2 + (da - db)**2 + add)**3 &
     944             :             + add0/SQRT(r**2 + (da + db)**2 + add)**3 - 2.0_dp*add0/SQRT(r**2 + da**2 + add)**3 &
     945       38355 :             - 2.0_dp*add0/SQRT(r**2 + db**2 + add)**3
     946       38355 :          charg = -qxxqxx*0.125_dp*fact
     947       38355 :          RETURN
     948             :       END IF
     949             :       ! XX - YY
     950       76710 :       IF (l1 == 2 .AND. l2 == 2 .AND. m1 == CLMyy .AND. m2 == CLMxx) THEN
     951             :          qxxqyy = &
     952             :             +add0/SQRT(r**2 + add)**3 - add0/SQRT(r**2 + da**2 + add)**3 &
     953       38355 :             - add0/SQRT(r**2 + db**2 + add)**3 + add0/SQRT(r**2 + da**2 + db**2 + add)**3
     954       38355 :          charg = -qxxqyy*0.25_dp*fact
     955       38355 :          RETURN
     956             :       END IF
     957             :       ! XY - XY
     958       38355 :       IF (l1 == 2 .AND. l2 == 2 .AND. m1 == CLMxy .AND. m2 == CLMxy) THEN
     959             :          qxxqxx = &
     960             :             +2.0_dp*add0/SQRT(r**2 + add)**3 + add0/SQRT(r**2 + (da - db)**2 + add)**3 &
     961             :             + add0/SQRT(r**2 + (da + db)**2 + add)**3 - 2.0_dp*add0/SQRT(r**2 + da**2 + add)**3 &
     962       38355 :             - 2.0_dp*add0/SQRT(r**2 + db**2 + add)**3
     963             :          qxxqyy = &
     964             :             +add0/SQRT(r**2 + add)**3 - add0/SQRT(r**2 + da**2 + add)**3 &
     965       38355 :             - add0/SQRT(r**2 + db**2 + add)**3 + add0/SQRT(r**2 + da**2 + db**2 + add)**3
     966       38355 :          charg = -0.5_dp*(qxxqxx*0.125_dp - qxxqyy*0.25_dp)*fact
     967       38355 :          RETURN
     968             :       END IF
     969             :       ! We should NEVER reach this point
     970           0 :       CPABORT("")
     971           0 :    END FUNCTION dcharg_int_nri_fs
     972             : 
     973             : ! **************************************************************************************************
     974             : !> \brief General driver for computing semi-empirical integrals <ij|kl>
     975             : !>        involving d-orbitals.
     976             : !>        The choice of the linear quadrupole was REALLY unhappy
     977             : !>        in the first development of the NDDO codes. That choice makes
     978             : !>        impossible the merging of the integral code with or without d-orbitals
     979             : !>        unless a reparametrization of all NDDO codes for s and p orbitals will
     980             : !>        be performed.. more over the choice of the linear quadrupole does not make
     981             : !>        calculations rotational invariants (of course the rotational invariant
     982             : !>        can be forced). The definitions of quadrupoles for d-orbitals is the
     983             : !>        correct one in order to have the rotational invariant property by
     984             : !>        construction..
     985             : !>
     986             : !> \param sepi ...
     987             : !> \param sepj ...
     988             : !> \param ij ...
     989             : !> \param kl ...
     990             : !> \param li ...
     991             : !> \param lj ...
     992             : !> \param lk ...
     993             : !> \param ll ...
     994             : !> \param ic ...
     995             : !> \param r ...
     996             : !> \param se_int_control ...
     997             : !> \param se_int_screen ...
     998             : !> \param itype ...
     999             : !> \return ...
    1000             : !> \date 03.2008 [tlaino]
    1001             : !> \author Teodoro Laino [tlaino] - University of Zurich
    1002             : ! **************************************************************************************************
    1003     2873682 :    FUNCTION ijkl_d(sepi, sepj, ij, kl, li, lj, lk, ll, ic, r, se_int_control, &
    1004             :                    se_int_screen, itype) RESULT(res)
    1005             :       TYPE(semi_empirical_type), POINTER                 :: sepi, sepj
    1006             :       INTEGER, INTENT(IN)                                :: ij, kl, li, lj, lk, ll, ic
    1007             :       REAL(KIND=dp), INTENT(IN)                          :: r
    1008             :       TYPE(se_int_control_type), INTENT(IN)              :: se_int_control
    1009             :       TYPE(se_int_screen_type), INTENT(IN)               :: se_int_screen
    1010             :       INTEGER, INTENT(IN)                                :: itype
    1011             :       REAL(KIND=dp)                                      :: res
    1012             : 
    1013             :       res = ijkl_d_low(sepi, sepj, ij, kl, li, lj, lk, ll, ic, r, se_int_screen, &
    1014             :                        se_int_control%integral_screening, se_int_control%shortrange, &
    1015             :                        se_int_control%pc_coulomb_int, se_int_control%max_multipole, &
    1016     2873682 :                        itype, charg_int_ri)
    1017             : 
    1018             :       ! If only the shortrange component is requested we can skip the rest
    1019     2873682 :       IF ((.NOT. se_int_control%pc_coulomb_int) .AND. (itype /= do_method_pchg)) THEN
    1020             :          ! Handle the 1/r^3 term, this term is ALWAYS false for KDSO-D integrals
    1021     2674266 :          IF (se_int_control%shortrange .AND. se_int_control%do_ewald_r3) THEN
    1022             :             res = res - ijkl_low_3(sepi, sepj, ij, kl, li, lj, lk, ll, ic, r, &
    1023           0 :                                    itype, charg_int_3)
    1024             :          END IF
    1025             :       END IF
    1026     2873682 :    END FUNCTION ijkl_d
    1027             : 
    1028             : ! **************************************************************************************************
    1029             : !> \brief General driver for computing the derivatives of semi-empirical integrals <ij|kl>
    1030             : !>        involving d-orbitals.
    1031             : !>        The choice of the linear quadrupole was REALLY unhappy
    1032             : !>        in the first development of the NDDO codes. That choice makes
    1033             : !>        impossible the merging of the integral code with or without d-orbitals
    1034             : !>        unless a reparametrization of all NDDO codes for s and p orbitals will
    1035             : !>        be performed.. more over the choice of the linear quadrupole does not make
    1036             : !>        calculations rotational invariants (of course the rotational invariant
    1037             : !>        can be forced). The definitions of quadrupoles for d-orbitals is the
    1038             : !>        correct one in order to have the rotational invariant property by
    1039             : !>        construction..
    1040             : !>
    1041             : !> \param sepi ...
    1042             : !> \param sepj ...
    1043             : !> \param ij ...
    1044             : !> \param kl ...
    1045             : !> \param li ...
    1046             : !> \param lj ...
    1047             : !> \param lk ...
    1048             : !> \param ll ...
    1049             : !> \param ic ...
    1050             : !> \param r ...
    1051             : !> \param se_int_control ...
    1052             : !> \param se_int_screen ...
    1053             : !> \param itype ...
    1054             : !> \return ...
    1055             : !> \date 03.2008 [tlaino]
    1056             : !> \author Teodoro Laino [tlaino] - University of Zurich
    1057             : ! **************************************************************************************************
    1058     1373222 :    FUNCTION d_ijkl_d(sepi, sepj, ij, kl, li, lj, lk, ll, ic, r, se_int_control, &
    1059             :                      se_int_screen, itype) RESULT(res)
    1060             :       TYPE(semi_empirical_type), POINTER                 :: sepi, sepj
    1061             :       INTEGER, INTENT(IN)                                :: ij, kl, li, lj, lk, ll, ic
    1062             :       REAL(KIND=dp), INTENT(IN)                          :: r
    1063             :       TYPE(se_int_control_type), INTENT(IN)              :: se_int_control
    1064             :       TYPE(se_int_screen_type), INTENT(IN)               :: se_int_screen
    1065             :       INTEGER, INTENT(IN)                                :: itype
    1066             :       REAL(KIND=dp)                                      :: res
    1067             : 
    1068             :       REAL(KIND=dp)                                      :: dfs, srd
    1069             : 
    1070     1373222 :       IF (se_int_control%integral_screening == do_se_IS_kdso_d) THEN
    1071             :          res = ijkl_d_low(sepi, sepj, ij, kl, li, lj, lk, ll, ic, r, se_int_screen, &
    1072             :                           se_int_control%integral_screening, .FALSE., &
    1073             :                           se_int_control%pc_coulomb_int, se_int_control%max_multipole, &
    1074      810708 :                           itype, dcharg_int_ri)
    1075             : 
    1076      810708 :          IF (.NOT. se_int_control%pc_coulomb_int) THEN
    1077             :             dfs = ijkl_d_low(sepi, sepj, ij, kl, li, lj, lk, ll, ic, r, se_int_screen, &
    1078             :                              se_int_control%integral_screening, .FALSE., .FALSE., &
    1079      711000 :                              se_int_control%max_multipole, itype, dcharg_int_ri_fs)
    1080      711000 :             res = res + dfs*se_int_screen%dft
    1081             : 
    1082             :             ! In case we need the shortrange part we have to evaluate an additional derivative
    1083             :             ! to handle the derivative of the Tapering term
    1084      711000 :             IF (se_int_control%shortrange) THEN
    1085             :                srd = ijkl_d_low(sepi, sepj, ij, kl, li, lj, lk, ll, ic, r, se_int_screen, &
    1086             :                                 se_int_control%integral_screening, .FALSE., .TRUE., &
    1087      711000 :                                 se_int_control%max_multipole, itype, dcharg_int_ri)
    1088      711000 :                res = res - srd
    1089             :             END IF
    1090             :          END IF
    1091             :       ELSE
    1092             :          res = ijkl_d_low(sepi, sepj, ij, kl, li, lj, lk, ll, ic, r, se_int_screen, &
    1093             :                           se_int_control%integral_screening, se_int_control%shortrange, &
    1094             :                           se_int_control%pc_coulomb_int, se_int_control%max_multipole, &
    1095      562514 :                           itype, dcharg_int_ri)
    1096             :       END IF
    1097             : 
    1098             :       ! If only the shortrange component is requested we can skip the rest
    1099     1373222 :       IF ((.NOT. se_int_control%pc_coulomb_int) .AND. (itype /= do_method_pchg)) THEN
    1100             :          ! Handle the 1/r^3 term, this term is ALWAYS false for KDSO-D integrals
    1101     1273514 :          IF (se_int_control%shortrange .AND. se_int_control%do_ewald_r3) THEN
    1102             :             res = res - ijkl_low_3(sepi, sepj, ij, kl, li, lj, lk, ll, ic, r, &
    1103           0 :                                    itype, dcharg_int_3)
    1104             :          END IF
    1105             :       END IF
    1106             : 
    1107     1373222 :    END FUNCTION d_ijkl_d
    1108             : 
    1109             : ! **************************************************************************************************
    1110             : !> \brief Low level general driver for computing semi-empirical integrals <ij|kl>
    1111             : !>        and their derivatives involving d-orbitals.
    1112             : !>        The choice of the linear quadrupole was REALLY unhappy
    1113             : !>        in the first development of the NDDO codes. That choice makes
    1114             : !>        impossible the merging of the integral code with or without d-orbitals
    1115             : !>        unless a reparametrization of all NDDO codes for s and p orbitals will
    1116             : !>        be performed.. more over the choice of the linear quadrupole does not make
    1117             : !>        calculations rotational invariants (of course the rotational invariant
    1118             : !>        can be forced). The definitions of quadrupoles for d-orbitals is the
    1119             : !>        correct one in order to have the rotational invariant property by
    1120             : !>        construction..
    1121             : !>
    1122             : !> \param sepi ...
    1123             : !> \param sepj ...
    1124             : !> \param ij ...
    1125             : !> \param kl ...
    1126             : !> \param li ...
    1127             : !> \param lj ...
    1128             : !> \param lk ...
    1129             : !> \param ll ...
    1130             : !> \param ic ...
    1131             : !> \param r ...
    1132             : !> \param se_int_screen ...
    1133             : !> \param iscreen ...
    1134             : !> \param shortrange ...
    1135             : !> \param pc_coulomb_int ...
    1136             : !> \param max_multipole ...
    1137             : !> \param itype ...
    1138             : !> \param eval a function without explicit interface
    1139             : !> \return ...
    1140             : !> \date 03.2008 [tlaino]
    1141             : !> \author Teodoro Laino [tlaino] - University of Zurich
    1142             : ! **************************************************************************************************
    1143     5668904 :    FUNCTION ijkl_d_low(sepi, sepj, ij, kl, li, lj, lk, ll, ic, r, se_int_screen, &
    1144             :                        iscreen, shortrange, pc_coulomb_int, max_multipole, itype, eval) RESULT(res)
    1145             :       TYPE(semi_empirical_type), POINTER                 :: sepi, sepj
    1146             :       INTEGER, INTENT(IN)                                :: ij, kl, li, lj, lk, ll, ic
    1147             :       REAL(KIND=dp), INTENT(IN)                          :: r
    1148             :       TYPE(se_int_screen_type), INTENT(IN)               :: se_int_screen
    1149             :       INTEGER, INTENT(IN)                                :: iscreen
    1150             :       LOGICAL, INTENT(IN)                                :: shortrange, pc_coulomb_int
    1151             :       INTEGER, INTENT(IN)                                :: max_multipole, itype
    1152             : 
    1153             :       PROCEDURE(eval_func_d)                               :: eval
    1154             :       REAL(KIND=dp)                                      :: res
    1155             : 
    1156             :       INTEGER                                            :: l1, l1max, l1min, l2, l2max, l2min, lij, &
    1157             :                                                             lkl, lmin, m, mm
    1158             :       REAL(KIND=dp)                                      :: add, ccc, chrg, dij, dkl, fact_screen, &
    1159             :                                                             pij, pkl, s1, sum
    1160             : 
    1161     5668904 :       l1min = ABS(li - lj)
    1162     5668904 :       l1max = li + lj
    1163     5668904 :       lij = indexb(li + 1, lj + 1)
    1164     5668904 :       l2min = ABS(lk - ll)
    1165     5668904 :       l2max = lk + ll
    1166     5668904 :       lkl = indexb(lk + 1, ll + 1)
    1167             : 
    1168     5668904 :       l1max = MIN(l1max, 2)
    1169     5668904 :       l1min = MIN(l1min, 2)
    1170     5668904 :       l2max = MIN(l2max, 2)
    1171     5668904 :       l2min = MIN(l2min, 2)
    1172     5668904 :       sum = 0.0_dp
    1173     5668904 :       dij = 0.0_dp
    1174     5668904 :       dkl = 0.0_dp
    1175     5668904 :       fact_screen = 1.0_dp
    1176     5668904 :       IF (.NOT. pc_coulomb_int) THEN
    1177     4658780 :          IF (iscreen == do_se_IS_kdso_d) fact_screen = se_int_screen%ft
    1178             :          ! Standard value of the integral
    1179    14783386 :          DO l1 = l1min, l1max
    1180    10124606 :             IF (l1 == 0) THEN
    1181     2651891 :                IF (lij == 1) THEN
    1182      466356 :                   pij = sepi%ko(1)
    1183      466356 :                   IF (ic == 1) THEN
    1184      205998 :                      pij = sepi%ko(9)
    1185             :                   END IF
    1186     2185535 :                ELSE IF (lij == 3) THEN
    1187      866784 :                   pij = sepi%ko(7)
    1188     1318751 :                ELSE IF (lij == 6) THEN
    1189     1318751 :                   pij = sepi%ko(8)
    1190             :                END IF
    1191             :             ELSE
    1192     7472715 :                dij = sepi%cs(lij)
    1193     7472715 :                pij = sepi%ko(lij)
    1194             :             END IF
    1195             :             !
    1196    36584358 :             DO l2 = l2min, l2max
    1197    21800972 :                IF (l2 == 0) THEN
    1198     5970952 :                   IF (lkl == 1) THEN
    1199     1214094 :                      pkl = sepj%ko(1)
    1200     1214094 :                      IF (ic == 2) THEN
    1201      493346 :                         pkl = sepj%ko(9)
    1202             :                      END IF
    1203     4756858 :                   ELSE IF (lkl == 3) THEN
    1204     2141370 :                      pkl = sepj%ko(7)
    1205     2615488 :                   ELSE IF (lkl == 6) THEN
    1206     2615488 :                      pkl = sepj%ko(8)
    1207             :                   END IF
    1208             :                ELSE
    1209    15830020 :                   dkl = sepj%cs(lkl)
    1210    15830020 :                   pkl = sepj%ko(lkl)
    1211             :                END IF
    1212    21800972 :                IF (itype == do_method_pchg) THEN
    1213           0 :                   add = 0.0_dp
    1214             :                ELSE
    1215    21800972 :                   add = (pij + pkl)**2
    1216             :                END IF
    1217    21800972 :                lmin = MIN(l1, l2)
    1218    21800972 :                s1 = 0.0_dp
    1219    72210402 :                DO m = -lmin, lmin
    1220    50409430 :                   ccc = clm_d(ij, l1, m)*clm_d(kl, l2, m)
    1221    72210402 :                   IF (ABS(ccc) > EPSILON(0.0_dp)) THEN
    1222     8019068 :                      mm = ABS(m)
    1223     8019068 :                      chrg = eval(r, l1, l2, mm, dij, dkl, add, fact_screen)
    1224     8019068 :                      s1 = s1 + chrg*ccc
    1225             :                   END IF
    1226             :                END DO
    1227    31925578 :                sum = sum + s1
    1228             :             END DO
    1229             :          END DO
    1230             :          res = sum
    1231             :       END IF
    1232             :       ! Shortrange: Possibly computes pure Coulomb and subtract from the original integral valeu
    1233     5668904 :       IF (shortrange .OR. pc_coulomb_int) THEN
    1234     2432124 :          sum = 0.0_dp
    1235     2432124 :          dij = 0.0_dp
    1236     2432124 :          dkl = 0.0_dp
    1237     2432124 :          add = 0.0_dp
    1238     2432124 :          fact_screen = 0.0_dp
    1239     7751484 :          DO l1 = l1min, l1max
    1240     5319360 :             IF (l1 > max_multipole) CYCLE
    1241     5319360 :             IF (l1 /= 0) THEN
    1242     3961368 :                dij = sepi%cs(lij)
    1243             :             END IF
    1244             :             !
    1245    19373688 :             DO l2 = l2min, l2max
    1246    11622204 :                IF (l2 > max_multipole) CYCLE
    1247    11622204 :                IF (l2 /= 0) THEN
    1248     8607240 :                   dkl = sepj%cs(lkl)
    1249             :                END IF
    1250    11622204 :                lmin = MIN(l1, l2)
    1251    11622204 :                s1 = 0.0_dp
    1252    39100932 :                DO m = -lmin, lmin
    1253    27478728 :                   ccc = clm_d(ij, l1, m)*clm_d(kl, l2, m)
    1254    39100932 :                   IF (ABS(ccc) > EPSILON(0.0_dp)) THEN
    1255     4133502 :                      mm = ABS(m)
    1256     4133502 :                      chrg = eval(r, l1, l2, mm, dij, dkl, add, fact_screen)
    1257     4133502 :                      s1 = s1 + chrg*ccc
    1258             :                   END IF
    1259             :                END DO
    1260    16941564 :                sum = sum + s1
    1261             :             END DO
    1262             :          END DO
    1263     2432124 :          IF (pc_coulomb_int) res = sum
    1264     2432124 :          IF (shortrange) res = res - sum
    1265             :       END IF
    1266     5668904 :    END FUNCTION ijkl_d_low
    1267             : 
    1268             : ! **************************************************************************************************
    1269             : !> \brief Interaction function between two point-charge configurations (MNDO/d)
    1270             : !>        Rotational invariant property built-in in the quadrupole definition
    1271             : !>        r    -  Distance r12
    1272             : !>        l1,m -  Quantum numbers for multipole of configuration 1
    1273             : !>        l2,m -  Quantum numbers for multipole of configuration 2
    1274             : !>        da   -  charge separation of configuration 1
    1275             : !>        db   -  charge separation of configuration 2
    1276             : !>        add  -  additive term
    1277             : !>
    1278             : !> \param r ...
    1279             : !> \param l1_i ...
    1280             : !> \param l2_i ...
    1281             : !> \param m ...
    1282             : !> \param da_i ...
    1283             : !> \param db_i ...
    1284             : !> \param add0 ...
    1285             : !> \param fact_screen ...
    1286             : !> \return ...
    1287             : !> \date 03.2008 [tlaino]
    1288             : !> \author Teodoro Laino [tlaino] - University of Zurich
    1289             : ! **************************************************************************************************
    1290     7367875 :    FUNCTION charg_int_ri(r, l1_i, l2_i, m, da_i, db_i, add0, fact_screen) RESULT(charg)
    1291             :       REAL(KIND=dp), INTENT(in)                          :: r
    1292             :       INTEGER, INTENT(in)                                :: l1_i, l2_i, m
    1293             :       REAL(KIND=dp), INTENT(in)                          :: da_i, db_i, add0, fact_screen
    1294             :       REAL(KIND=dp)                                      :: charg
    1295             : 
    1296             :       INTEGER                                            :: l1, l2
    1297             :       REAL(KIND=dp)                                      :: aa, ab, add, da, db, dxdx, dxqxz, dzdz, &
    1298             :                                                             dzqzz, fact, qqzz, qxzqxz, xyxy, zzzz
    1299             : 
    1300     7367875 :       IF (l1_i <= l2_i) THEN
    1301     5187661 :          l1 = l1_i
    1302     5187661 :          l2 = l2_i
    1303     5187661 :          da = da_i
    1304     5187661 :          db = db_i
    1305     5187661 :          fact = 1.0_dp
    1306             :       ELSE IF (l1_i > l2_i) THEN
    1307     2180214 :          l1 = l2_i
    1308     2180214 :          l2 = l1_i
    1309     2180214 :          da = db_i
    1310     2180214 :          db = da_i
    1311     2180214 :          fact = (-1.0_dp)**(l1 + l2)
    1312             :       END IF
    1313     7367875 :       charg = 0.0_dp
    1314     7367875 :       add = add0*fact_screen
    1315             :       ! Q - Q.
    1316     7367875 :       IF (l1 == 0 .AND. l2 == 0) THEN
    1317     1020785 :          charg = fact/SQRT(r**2 + add)
    1318     1020785 :          RETURN
    1319             :       END IF
    1320             :       ! Q - Z.
    1321     6347090 :       IF (l1 == 0 .AND. l2 == 1) THEN
    1322      972950 :          charg = 1.0_dp/SQRT((r + db)**2 + add) - 1.0_dp/SQRT((r - db)**2 + add)
    1323      972950 :          charg = charg*0.5_dp*fact
    1324      972950 :          RETURN
    1325             :       END IF
    1326             :       ! Z - Z.
    1327     5374140 :       IF (l1 == 1 .AND. l2 == 1 .AND. m == 0) THEN
    1328             :          dzdz = &
    1329             :             +1.0_dp/SQRT((r + da - db)**2 + add) + 1.0_dp/SQRT((r - da + db)**2 + add) &
    1330      185584 :             - 1.0_dp/SQRT((r - da - db)**2 + add) - 1.0_dp/SQRT((r + da + db)**2 + add)
    1331      185584 :          charg = dzdz*0.25_dp*fact
    1332      185584 :          RETURN
    1333             :       END IF
    1334             :       ! X - X
    1335     5188556 :       IF (l1 == 1 .AND. l2 == 1 .AND. m == 1) THEN
    1336      303696 :          dxdx = 2.0_dp/SQRT(r**2 + (da - db)**2 + add) - 2.0_dp/SQRT(r**2 + (da + db)**2 + add)
    1337      303696 :          charg = dxdx*0.25_dp*fact
    1338      303696 :          RETURN
    1339             :       END IF
    1340             :       ! Q - ZZ
    1341     4884860 :       IF (l1 == 0 .AND. l2 == 2) THEN
    1342     1945900 :          qqzz = 1.0_dp/SQRT((r - db)**2 + add) - 2.0_dp/SQRT(r**2 + db**2 + add) + 1.0_dp/SQRT((r + db)**2 + add)
    1343     1945900 :          charg = qqzz*0.25_dp*fact
    1344     1945900 :          RETURN
    1345             :       END IF
    1346             :       ! Z - ZZ
    1347     2938960 :       IF (l1 == 1 .AND. l2 == 2 .AND. m == 0) THEN
    1348             :          dzqzz = &
    1349             :             +1.0_dp/SQRT((r - da - db)**2 + add) - 2.0_dp/SQRT((r - da)**2 + db**2 + add) &
    1350             :             + 1.0_dp/SQRT((r + db - da)**2 + add) - 1.0_dp/SQRT((r - db + da)**2 + add) &
    1351      789552 :             + 2.0_dp/SQRT((r + da)**2 + db**2 + add) - 1.0_dp/SQRT((r + da + db)**2 + add)
    1352      789552 :          charg = dzqzz*0.125_dp*fact
    1353      789552 :          RETURN
    1354             :       END IF
    1355             :       ! ZZ - ZZ
    1356     2149408 :       IF (l1 == 2 .AND. l2 == 2 .AND. m == 0) THEN
    1357             :          zzzz = &
    1358             :             +1.0_dp/SQRT((r - da - db)**2 + add) + 1.0_dp/SQRT((r + da + db)**2 + add) &
    1359             :             + 1.0_dp/SQRT((r - da + db)**2 + add) + 1.0_dp/SQRT((r + da - db)**2 + add) &
    1360             :             - 2.0_dp/SQRT((r - da)**2 + db**2 + add) - 2.0_dp/SQRT((r - db)**2 + da**2 + add) &
    1361             :             - 2.0_dp/SQRT((r + da)**2 + db**2 + add) - 2.0_dp/SQRT((r + db)**2 + da**2 + add) &
    1362      789552 :             + 2.0_dp/SQRT(r**2 + (da - db)**2 + add) + 2.0_dp/SQRT(r**2 + (da + db)**2 + add)
    1363             :          xyxy = &
    1364             :             +4.0_dp/SQRT(r**2 + (da - db)**2 + add) + 4.0_dp/SQRT(r**2 + (da + db)**2 + add) &
    1365      789552 :             - 8.0_dp/SQRT(r**2 + da**2 + db**2 + add)
    1366      789552 :          charg = (zzzz*0.0625_dp - xyxy*0.015625_dp)*fact
    1367      789552 :          RETURN
    1368             :       END IF
    1369             :       ! X - ZX
    1370     1359856 :       IF (l1 == 1 .AND. l2 == 2 .AND. m == 1) THEN
    1371      607392 :          ab = db/SQRT(2.0_dp)
    1372             :          dxqxz = &
    1373             :             -2.0_dp/SQRT((r - ab)**2 + (da - ab)**2 + add) + 2.0_dp/SQRT((r + ab)**2 + (da - ab)**2 + add) &
    1374      607392 :             + 2.0_dp/SQRT((r - ab)**2 + (da + ab)**2 + add) - 2.0_dp/SQRT((r + ab)**2 + (da + ab)**2 + add)
    1375      607392 :          charg = dxqxz*0.125_dp*fact
    1376      607392 :          RETURN
    1377             :       END IF
    1378             :       ! ZX - ZX
    1379      752464 :       IF (l1 == 2 .AND. l2 == 2 .AND. m == 1) THEN
    1380      303696 :          aa = da/SQRT(2.0_dp)
    1381      303696 :          ab = db/SQRT(2.0_dp)
    1382             :          qxzqxz = &
    1383             :             +2.0_dp/SQRT((r + aa - ab)**2 + (aa - ab)**2 + add) - 2.0_dp/SQRT((r + aa + ab)**2 + (aa - ab)**2 + add) &
    1384             :             - 2.0_dp/SQRT((r - aa - ab)**2 + (aa - ab)**2 + add) + 2.0_dp/SQRT((r - aa + ab)**2 + (aa - ab)**2 + add) &
    1385             :             - 2.0_dp/SQRT((r + aa - ab)**2 + (aa + ab)**2 + add) + 2.0_dp/SQRT((r + aa + ab)**2 + (aa + ab)**2 + add) &
    1386      303696 :             + 2.0_dp/SQRT((r - aa - ab)**2 + (aa + ab)**2 + add) - 2.0_dp/SQRT((r - aa + ab)**2 + (aa + ab)**2 + add)
    1387      303696 :          charg = qxzqxz*0.0625_dp*fact
    1388      303696 :          RETURN
    1389             :       END IF
    1390             :       ! XX - XX
    1391      448768 :       IF (l1 == 2 .AND. l2 == 2 .AND. m == 2) THEN
    1392      448768 :     xyxy = 4.0_dp/SQRT(r**2 + (da - db)**2 + add) + 4.0_dp/SQRT(r**2 + (da + db)**2 + add) - 8.0_dp/SQRT(r**2 + da**2 + db**2 + add)
    1393      448768 :          charg = xyxy*0.0625_dp*fact
    1394      448768 :          RETURN
    1395             :       END IF
    1396             :       ! We should NEVER reach this point
    1397           0 :       CPABORT("")
    1398           0 :    END FUNCTION charg_int_ri
    1399             : 
    1400             : ! **************************************************************************************************
    1401             : !> \brief Derivatives of the interaction function between two point-charge
    1402             : !>        configurations (MNDO/d)
    1403             : !>        Rotational invariant property built-in in the quadrupole definition
    1404             : !>        r    -  Distance r12
    1405             : !>        l1,m -  Quantum numbers for multipole of configuration 1
    1406             : !>        l2,m -  Quantum numbers for multipole of configuration 2
    1407             : !>        da   -  charge separation of configuration 1
    1408             : !>        db   -  charge separation of configuration 2
    1409             : !>        add  -  additive term
    1410             : !>
    1411             : !> \param r ...
    1412             : !> \param l1_i ...
    1413             : !> \param l2_i ...
    1414             : !> \param m ...
    1415             : !> \param da_i ...
    1416             : !> \param db_i ...
    1417             : !> \param add0 ...
    1418             : !> \param fact_screen ...
    1419             : !> \return ...
    1420             : !> \date 03.2008 [tlaino]
    1421             : !> \author Teodoro Laino [tlaino] - University of Zurich
    1422             : ! **************************************************************************************************
    1423     3575779 :    FUNCTION dcharg_int_ri(r, l1_i, l2_i, m, da_i, db_i, add0, fact_screen) RESULT(charg)
    1424             :       REAL(KIND=dp), INTENT(in)                          :: r
    1425             :       INTEGER, INTENT(in)                                :: l1_i, l2_i, m
    1426             :       REAL(KIND=dp), INTENT(in)                          :: da_i, db_i, add0, fact_screen
    1427             :       REAL(KIND=dp)                                      :: charg
    1428             : 
    1429             :       INTEGER                                            :: l1, l2
    1430             :       REAL(KIND=dp)                                      :: aa, ab, add, da, db, dxdx, dxqxz, dzdz, &
    1431             :                                                             dzqzz, fact, qqzz, qxzqxz, xyxy, zzzz
    1432             : 
    1433     3575779 :       IF (l1_i <= l2_i) THEN
    1434     2520327 :          l1 = l1_i
    1435     2520327 :          l2 = l2_i
    1436     2520327 :          da = da_i
    1437     2520327 :          db = db_i
    1438     2520327 :          fact = 1.0_dp
    1439             :       ELSE IF (l1_i > l2_i) THEN
    1440     1055452 :          l1 = l2_i
    1441     1055452 :          l2 = l1_i
    1442     1055452 :          da = db_i
    1443     1055452 :          db = da_i
    1444     1055452 :          fact = (-1.0_dp)**(l1 + l2)
    1445             :       END IF
    1446     3575779 :       charg = 0.0_dp
    1447     3575779 :       add = add0*fact_screen
    1448             :       ! Q - Q.
    1449     3575779 :       IF (l1 == 0 .AND. l2 == 0) THEN
    1450      492107 :          charg = r/SQRT(r**2 + add)**3
    1451      492107 :          charg = -fact*charg
    1452      492107 :          RETURN
    1453             :       END IF
    1454             :       ! Q - Z.
    1455     3083672 :       IF (l1 == 0 .AND. l2 == 1) THEN
    1456      470618 :          charg = (r + db)/SQRT((r + db)**2 + add)**3 - (r - db)/SQRT((r - db)**2 + add)**3
    1457      470618 :          charg = -charg*0.5_dp*fact
    1458      470618 :          RETURN
    1459             :       END IF
    1460             :       ! Z - Z.
    1461     2613054 :       IF (l1 == 1 .AND. l2 == 1 .AND. m == 0) THEN
    1462             :          dzdz = &
    1463             :             +(r + da - db)/SQRT((r + da - db)**2 + add)**3 + (r - da + db)/SQRT((r - da + db)**2 + add)**3 &
    1464       90503 :             - (r - da - db)/SQRT((r - da - db)**2 + add)**3 - (r + da + db)/SQRT((r + da + db)**2 + add)**3
    1465       90503 :          charg = -dzdz*0.25_dp*fact
    1466       90503 :          RETURN
    1467             :       END IF
    1468             :       ! X - X
    1469     2522551 :       IF (l1 == 1 .AND. l2 == 1 .AND. m == 1) THEN
    1470      148192 :          dxdx = 2.0_dp*r/SQRT(r**2 + (da - db)**2 + add)**3 - 2.0_dp*r/SQRT(r**2 + (da + db)**2 + add)**3
    1471      148192 :          charg = -dxdx*0.25_dp*fact
    1472      148192 :          RETURN
    1473             :       END IF
    1474             :       ! Q - ZZ
    1475     2374359 :       IF (l1 == 0 .AND. l2 == 2) THEN
    1476      941236 :          qqzz = (r - db)/SQRT((r - db)**2 + add)**3 - 2.0_dp*r/SQRT(r**2 + db**2 + add)**3 + (r + db)/SQRT((r + db)**2 + add)**3
    1477      941236 :          charg = -qqzz*0.25_dp*fact
    1478      941236 :          RETURN
    1479             :       END IF
    1480             :       ! Z - ZZ
    1481     1433123 :       IF (l1 == 1 .AND. l2 == 2 .AND. m == 0) THEN
    1482             :          dzqzz = &
    1483             :             +(r - da - db)/SQRT((r - da - db)**2 + add)**3 - 2.0_dp*(r - da)/SQRT((r - da)**2 + db**2 + add)**3 &
    1484             :             + (r + db - da)/SQRT((r + db - da)**2 + add)**3 - (r - db + da)/SQRT((r - db + da)**2 + add)**3 &
    1485      384876 :             + 2.0_dp*(r + da)/SQRT((r + da)**2 + db**2 + add)**3 - (r + da + db)/SQRT((r + da + db)**2 + add)**3
    1486      384876 :          charg = -dzqzz*0.125_dp*fact
    1487      384876 :          RETURN
    1488             :       END IF
    1489             :       ! ZZ - ZZ
    1490     1048247 :       IF (l1 == 2 .AND. l2 == 2 .AND. m == 0) THEN
    1491             :          zzzz = &
    1492             :             +(r - da - db)/SQRT((r - da - db)**2 + add)**3 + (r + da + db)/SQRT((r + da + db)**2 + add)**3 &
    1493             :             + (r - da + db)/SQRT((r - da + db)**2 + add)**3 + (r + da - db)/SQRT((r + da - db)**2 + add)**3 &
    1494             :             - 2.0_dp*(r - da)/SQRT((r - da)**2 + db**2 + add)**3 - 2.0_dp*(r - db)/SQRT((r - db)**2 + da**2 + add)**3 &
    1495             :             - 2.0_dp*(r + da)/SQRT((r + da)**2 + db**2 + add)**3 - 2.0_dp*(r + db)/SQRT((r + db)**2 + da**2 + add)**3 &
    1496      384876 :             + 2.0_dp*r/SQRT(r**2 + (da - db)**2 + add)**3 + 2.0_dp*r/SQRT(r**2 + (da + db)**2 + add)**3
    1497             :          xyxy = &
    1498             :             +4.0_dp*r/SQRT(r**2 + (da - db)**2 + add)**3 + 4.0_dp*r/SQRT(r**2 + (da + db)**2 + add)**3 &
    1499      384876 :             - 8.0_dp*r/SQRT(r**2 + da**2 + db**2 + add)**3
    1500      384876 :          charg = -(zzzz*0.0625_dp - xyxy*0.015625_dp)*fact
    1501      384876 :          RETURN
    1502             :       END IF
    1503             :       ! X - ZX
    1504      663371 :       IF (l1 == 1 .AND. l2 == 2 .AND. m == 1) THEN
    1505      296384 :          ab = db/SQRT(2.0_dp)
    1506             :          dxqxz = &
    1507             :             -2.0_dp*(r - ab)/SQRT((r - ab)**2 + (da - ab)**2 + add)**3 + 2.0_dp*(r + ab)/SQRT((r + ab)**2 + (da - ab)**2 + add)**3 &
    1508      296384 :             + 2.0_dp*(r - ab)/SQRT((r - ab)**2 + (da + ab)**2 + add)**3 - 2.0_dp*(r + ab)/SQRT((r + ab)**2 + (da + ab)**2 + add)**3
    1509      296384 :          charg = -dxqxz*0.125_dp*fact
    1510      296384 :          RETURN
    1511             :       END IF
    1512             :       ! ZX - ZX
    1513      366987 :       IF (l1 == 2 .AND. l2 == 2 .AND. m == 1) THEN
    1514      148192 :          aa = da/SQRT(2.0_dp)
    1515      148192 :          ab = db/SQRT(2.0_dp)
    1516             :          qxzqxz = &
    1517             :             +2.0_dp*(r+aa-ab)/SQRT((r+aa-ab)**2+(aa-ab)**2+add)**3-2.0_dp*(r+aa+ab)/SQRT((r+aa+ab)**2+(aa-ab)**2+add)**3 &
    1518             :             -2.0_dp*(r-aa-ab)/SQRT((r-aa-ab)**2+(aa-ab)**2+add)**3+2.0_dp*(r-aa+ab)/SQRT((r-aa+ab)**2+(aa-ab)**2+add)**3 &
    1519             :             -2.0_dp*(r+aa-ab)/SQRT((r+aa-ab)**2+(aa+ab)**2+add)**3+2.0_dp*(r+aa+ab)/SQRT((r+aa+ab)**2+(aa+ab)**2+add)**3 &
    1520      148192 :             +2.0_dp*(r-aa-ab)/SQRT((r-aa-ab)**2+(aa+ab)**2+add)**3-2.0_dp*(r-aa+ab)/SQRT((r-aa+ab)**2+(aa+ab)**2+add)**3
    1521      148192 :          charg = -qxzqxz*0.0625_dp*fact
    1522      148192 :          RETURN
    1523             :       END IF
    1524             :       ! XX - XX
    1525      218795 :       IF (l1 == 2 .AND. l2 == 2 .AND. m == 2) THEN
    1526      218795 :          xyxy = 4.0_dp*r/SQRT(r**2+(da-db)**2+add)**3+4.0_dp*r/SQRT(r**2+(da+db)**2+add)**3-8.0_dp*r/SQRT(r**2+da**2+db**2+add)**3
    1527      218795 :          charg = -xyxy*0.0625_dp*fact
    1528      218795 :          RETURN
    1529             :       END IF
    1530             :       ! We should NEVER reach this point
    1531           0 :       CPABORT("")
    1532           0 :    END FUNCTION dcharg_int_ri
    1533             : 
    1534             : ! **************************************************************************************************
    1535             : !> \brief Derivatives of the interaction function between two point-charge
    1536             : !>        configurations (MNDO/d). This derivative takes into account only the
    1537             : !>        tapering term
    1538             : !>        Rotational invariant property built-in in the quadrupole definition
    1539             : !>        r    -  Distance r12
    1540             : !>        l1,m -  Quantum numbers for multipole of configuration 1
    1541             : !>        l2,m -  Quantum numbers for multipole of configuration 2
    1542             : !>        da   -  charge separation of configuration 1
    1543             : !>        db   -  charge separation of configuration 2
    1544             : !>        add  -  additive term
    1545             : !>
    1546             : !> \param r ...
    1547             : !> \param l1_i ...
    1548             : !> \param l2_i ...
    1549             : !> \param m ...
    1550             : !> \param da_i ...
    1551             : !> \param db_i ...
    1552             : !> \param add0 ...
    1553             : !> \param fact_screen ...
    1554             : !> \return ...
    1555             : !> \date 03.2008 [tlaino]
    1556             : !> \author Teodoro Laino [tlaino] - University of Zurich
    1557             : ! **************************************************************************************************
    1558     1208916 :    FUNCTION dcharg_int_ri_fs(r, l1_i, l2_i, m, da_i, db_i, add0, fact_screen) RESULT(charg)
    1559             :       REAL(KIND=dp), INTENT(in)                          :: r
    1560             :       INTEGER, INTENT(in)                                :: l1_i, l2_i, m
    1561             :       REAL(KIND=dp), INTENT(in)                          :: da_i, db_i, add0, fact_screen
    1562             :       REAL(KIND=dp)                                      :: charg
    1563             : 
    1564             :       INTEGER                                            :: l1, l2
    1565             :       REAL(KIND=dp)                                      :: aa, ab, add, da, db, dxdx, dxqxz, dzdz, &
    1566             :                                                             dzqzz, fact, qqzz, qxzqxz, xyxy, zzzz
    1567             : 
    1568     1208916 :       IF (l1_i <= l2_i) THEN
    1569      856818 :          l1 = l1_i
    1570      856818 :          l2 = l2_i
    1571      856818 :          da = da_i
    1572      856818 :          db = db_i
    1573      856818 :          fact = 1.0_dp
    1574             :       ELSE IF (l1_i > l2_i) THEN
    1575      352098 :          l1 = l2_i
    1576      352098 :          l2 = l1_i
    1577      352098 :          da = db_i
    1578      352098 :          db = da_i
    1579      352098 :          fact = (-1.0_dp)**(l1 + l2)
    1580             :       END IF
    1581     1208916 :       charg = 0.0_dp
    1582     1208916 :       add = add0*fact_screen
    1583             :       ! The 0.5 factor handles the derivative of the SQRT
    1584     1208916 :       fact = fact*0.5_dp
    1585             :       ! Q - Q.
    1586     1208916 :       IF (l1 == 0 .AND. l2 == 0) THEN
    1587      159552 :          charg = add0/SQRT(r**2 + add)**3
    1588      159552 :          charg = -fact*charg
    1589      159552 :          RETURN
    1590             :       END IF
    1591             :       ! Q - Z.
    1592     1049364 :       IF (l1 == 0 .AND. l2 == 1) THEN
    1593      155448 :          charg = add0/SQRT((r + db)**2 + add)**3 - add0/SQRT((r - db)**2 + add)**3
    1594      155448 :          charg = -charg*0.5_dp*fact
    1595      155448 :          RETURN
    1596             :       END IF
    1597             :       ! Z - Z.
    1598      893916 :       IF (l1 == 1 .AND. l2 == 1 .AND. m == 0) THEN
    1599             :          dzdz = &
    1600             :             +add0/SQRT((r + da - db)**2 + add)**3 + add0/SQRT((r - da + db)**2 + add)**3 &
    1601       31572 :             - add0/SQRT((r - da - db)**2 + add)**3 - add0/SQRT((r + da + db)**2 + add)**3
    1602       31572 :          charg = -dzdz*0.25_dp*fact
    1603       31572 :          RETURN
    1604             :       END IF
    1605             :       ! X - X
    1606      862344 :       IF (l1 == 1 .AND. l2 == 1 .AND. m == 1) THEN
    1607       52668 :          dxdx = 2.0_dp*add0/SQRT(r**2 + (da - db)**2 + add)**3 - 2.0_dp*add0/SQRT(r**2 + (da + db)**2 + add)**3
    1608       52668 :          charg = -dxdx*0.25_dp*fact
    1609       52668 :          RETURN
    1610             :       END IF
    1611             :       ! Q - ZZ
    1612      809676 :       IF (l1 == 0 .AND. l2 == 2) THEN
    1613      310896 :          qqzz = add0/SQRT((r - db)**2 + add)**3 - 2.0_dp*add0/SQRT(r**2 + db**2 + add)**3 + add0/SQRT((r + db)**2 + add)**3
    1614      310896 :          charg = -qqzz*0.25_dp*fact
    1615      310896 :          RETURN
    1616             :       END IF
    1617             :       ! Z - ZZ
    1618      498780 :       IF (l1 == 1 .AND. l2 == 2 .AND. m == 0) THEN
    1619             :          dzqzz = &
    1620             :             +add0/SQRT((r - da - db)**2 + add)**3 - 2.0_dp*add0/SQRT((r - da)**2 + db**2 + add)**3 &
    1621             :             + add0/SQRT((r + db - da)**2 + add)**3 - add0/SQRT((r - db + da)**2 + add)**3 &
    1622      132516 :             + 2.0_dp*add0/SQRT((r + da)**2 + db**2 + add)**3 - add0/SQRT((r + da + db)**2 + add)**3
    1623      132516 :          charg = -dzqzz*0.125_dp*fact
    1624      132516 :          RETURN
    1625             :       END IF
    1626             :       ! ZZ - ZZ
    1627      366264 :       IF (l1 == 2 .AND. l2 == 2 .AND. m == 0) THEN
    1628             :          zzzz = &
    1629             :             +add0/SQRT((r - da - db)**2 + add)**3 + add0/SQRT((r + da + db)**2 + add)**3 &
    1630             :             + add0/SQRT((r - da + db)**2 + add)**3 + add0/SQRT((r + da - db)**2 + add)**3 &
    1631             :             - 2.0_dp*add0/SQRT((r - da)**2 + db**2 + add)**3 - 2.0_dp*add0/SQRT((r - db)**2 + da**2 + add)**3 &
    1632             :             - 2.0_dp*add0/SQRT((r + da)**2 + db**2 + add)**3 - 2.0_dp*add0/SQRT((r + db)**2 + da**2 + add)**3 &
    1633      132516 :             + 2.0_dp*add0/SQRT(r**2 + (da - db)**2 + add)**3 + 2.0_dp*add0/SQRT(r**2 + (da + db)**2 + add)**3
    1634             :          xyxy = &
    1635             :             +4.0_dp*add0/SQRT(r**2 + (da - db)**2 + add)**3 + 4.0_dp*add0/SQRT(r**2 + (da + db)**2 + add)**3 &
    1636      132516 :             - 8.0_dp*add0/SQRT(r**2 + da**2 + db**2 + add)**3
    1637      132516 :          charg = -(zzzz*0.0625_dp - xyxy*0.015625_dp)*fact
    1638      132516 :          RETURN
    1639             :       END IF
    1640             :       ! X - ZX
    1641      233748 :       IF (l1 == 1 .AND. l2 == 2 .AND. m == 1) THEN
    1642      105336 :          ab = db/SQRT(2.0_dp)
    1643             :          dxqxz = &
    1644             :             -2.0_dp*add0/SQRT((r - ab)**2 + (da - ab)**2 + add)**3 + 2.0_dp*add0/SQRT((r + ab)**2 + (da - ab)**2 + add)**3 &
    1645      105336 :             + 2.0_dp*add0/SQRT((r - ab)**2 + (da + ab)**2 + add)**3 - 2.0_dp*add0/SQRT((r + ab)**2 + (da + ab)**2 + add)**3
    1646      105336 :          charg = -dxqxz*0.125_dp*fact
    1647      105336 :          RETURN
    1648             :       END IF
    1649             :       ! ZX - ZX
    1650      128412 :       IF (l1 == 2 .AND. l2 == 2 .AND. m == 1) THEN
    1651       52668 :          aa = da/SQRT(2.0_dp)
    1652       52668 :          ab = db/SQRT(2.0_dp)
    1653             :          qxzqxz = &
    1654             :           +2.0_dp*add0/SQRT((r + aa - ab)**2 + (aa - ab)**2 + add)**3 - 2.0_dp*add0/SQRT((r + aa + ab)**2 + (aa - ab)**2 + add)**3 &
    1655             :          - 2.0_dp*add0/SQRT((r - aa - ab)**2 + (aa - ab)**2 + add)**3 + 2.0_dp*add0/SQRT((r - aa + ab)**2 + (aa - ab)**2 + add)**3 &
    1656             :          - 2.0_dp*add0/SQRT((r + aa - ab)**2 + (aa + ab)**2 + add)**3 + 2.0_dp*add0/SQRT((r + aa + ab)**2 + (aa + ab)**2 + add)**3 &
    1657       52668 :            + 2.0_dp*add0/SQRT((r - aa - ab)**2 + (aa + ab)**2 + add)**3 - 2.0_dp*add0/SQRT((r - aa + ab)**2 + (aa + ab)**2 + add)**3
    1658       52668 :          charg = -qxzqxz*0.0625_dp*fact
    1659       52668 :          RETURN
    1660             :       END IF
    1661             :       ! XX - XX
    1662       75744 :       IF (l1 == 2 .AND. l2 == 2 .AND. m == 2) THEN
    1663             :          xyxy = 4.0_dp*add0/SQRT(r**2 + (da - db)**2 + add)**3 + 4.0_dp*add0/SQRT(r**2 + (da + db)**2 + add)**3 - &
    1664       75744 :                 8.0_dp*add0/SQRT(r**2 + da**2 + db**2 + add)**3
    1665       75744 :          charg = -xyxy*0.0625_dp*fact
    1666       75744 :          RETURN
    1667             :       END IF
    1668             :       ! We should NEVER reach this point
    1669           0 :       CPABORT("")
    1670           0 :    END FUNCTION dcharg_int_ri_fs
    1671             : 
    1672             : ! **************************************************************************************************
    1673             : !> \brief Computes the general rotation matrices for the integrals
    1674             : !>        between I and J (J>=I)
    1675             : !>
    1676             : !> \param sepi ...
    1677             : !> \param sepj ...
    1678             : !> \param rjiv ...
    1679             : !> \param r ...
    1680             : !> \param ij_matrix ...
    1681             : !> \param do_derivatives ...
    1682             : !> \param do_invert ...
    1683             : !> \param debug_invert ...
    1684             : !> \date 04.2008 [tlaino]
    1685             : !> \author Teodoro Laino [tlaino] - University of Zurich
    1686             : ! **************************************************************************************************
    1687    17364991 :    RECURSIVE SUBROUTINE rotmat(sepi, sepj, rjiv, r, ij_matrix, do_derivatives, &
    1688             :                                do_invert, debug_invert)
    1689             :       TYPE(semi_empirical_type), POINTER                 :: sepi, sepj
    1690             :       REAL(KIND=dp), DIMENSION(3), INTENT(IN)            :: rjiv
    1691             :       REAL(KIND=dp), INTENT(IN)                          :: r
    1692             :       TYPE(rotmat_type), POINTER                         :: ij_matrix
    1693             :       LOGICAL, INTENT(IN)                                :: do_derivatives
    1694             :       LOGICAL, INTENT(OUT), OPTIONAL                     :: do_invert
    1695             :       LOGICAL, INTENT(IN), OPTIONAL                      :: debug_invert
    1696             : 
    1697             :       INTEGER                                            :: imap(3), k, l
    1698             :       LOGICAL                                            :: dbg_inv, eval
    1699             :       REAL(KIND=dp)                                      :: b, c2a, c2b, ca, ca2, cb, cb2, check, &
    1700             :                                                             pt5sq3, r2i, s2a, s2b, sa, sb, sb2, &
    1701             :                                                             sqb, sqb2i, x11, x22, x33
    1702             :       REAL(KIND=dp), DIMENSION(3)                        :: b_d, c2a_d, c2b_d, ca2_d, ca_d, cb2_d, &
    1703             :                                                             cb_d, r_d, s2a_d, s2b_d, sa_d, sb2_d, &
    1704             :                                                             sb_d, sqb_d, x11_d, x22_d, x33_d
    1705             :       REAL(KIND=dp), DIMENSION(3, 3)                     :: p
    1706             :       REAL(KIND=dp), DIMENSION(3, 3, 3)                  :: p_d
    1707             :       REAL(KIND=dp), DIMENSION(3, 5, 5)                  :: d_d
    1708             :       REAL(KIND=dp), DIMENSION(5, 5)                     :: d
    1709             : 
    1710    17364991 :       CPASSERT(ASSOCIATED(ij_matrix))
    1711    17364991 :       IF (PRESENT(do_invert)) do_invert = .FALSE.
    1712    17364991 :       IF ((sepi%natorb > 1) .OR. (sepj%natorb > 1)) THEN
    1713             :          ! Compute Geomtric data and interatomic distance
    1714             :          !     CA  = COS(PHI)    , SA  = SIN(PHI)
    1715             :          !     CB  = COS(THETA)  , SB  = SIN(THETA)
    1716             :          !     C2A = COS(2*PHI)  , S2A = SIN(2*PHI)
    1717             :          !     C2B = COS(2*THETA), S2B = SIN(2*PHI)
    1718     8300795 :          eval = .TRUE.
    1719     8300795 :          dbg_inv = .FALSE.
    1720     8300795 :          pt5sq3 = 0.5_dp*SQRT(3.0_dp)
    1721     8300795 :          imap(1) = 1
    1722     8300795 :          imap(2) = 2
    1723     8300795 :          imap(3) = 3
    1724     8300795 :          check = rjiv(3)/r
    1725     8300795 :          IF (PRESENT(debug_invert)) dbg_inv = debug_invert
    1726             :          ! Check for special case: both atoms lie on the Z Axis
    1727     8300795 :          IF (ABS(check) > 0.99999999_dp) THEN
    1728        5682 :             IF (PRESENT(do_invert)) THEN
    1729        5389 :                imap(1) = 3
    1730        5389 :                imap(2) = 2
    1731        5389 :                imap(3) = 1
    1732        5389 :                eval = .TRUE.
    1733        5389 :                do_invert = .TRUE.
    1734             :             ELSE
    1735         293 :                sa = 0.0_dp
    1736         293 :                sb = 0.0_dp
    1737         293 :                IF (check < 0.0_dp) THEN
    1738             :                   ca = -1.0_dp
    1739             :                   cb = -1.0_dp
    1740         186 :                ELSE IF (check > 0.0_dp) THEN
    1741             :                   ca = 1.0_dp
    1742             :                   cb = 1.0_dp
    1743             :                ELSE
    1744           0 :                   ca = 0.0_dp
    1745           0 :                   cb = 0.0_dp
    1746             :                END IF
    1747             :                eval = .FALSE.
    1748             :             END IF
    1749             :          END IF
    1750     8300795 :          IF (dbg_inv) THEN
    1751             :             ! When debugging the derivatives of the rotation matrix we must possibly force
    1752             :             ! the inversion of the reference frame
    1753           0 :             CPASSERT(.NOT. do_derivatives)
    1754             :             imap(1) = 3
    1755             :             imap(2) = 2
    1756             :             imap(3) = 1
    1757             :             eval = .TRUE.
    1758             :          END IF
    1759     8300795 :          IF (eval) THEN
    1760     8300502 :             x11 = rjiv(imap(1))
    1761     8300502 :             x22 = rjiv(imap(2))
    1762     8300502 :             x33 = rjiv(imap(3))
    1763     8300502 :             cb = x33/r
    1764     8300502 :             b = x11**2 + x22**2
    1765     8300502 :             sqb = SQRT(b)
    1766     8300502 :             ca = x11/sqb
    1767     8300502 :             sa = x22/sqb
    1768     8300502 :             sb = sqb/r
    1769             :          END IF
    1770             :          ! Calculate rotation matrix elements
    1771     8300795 :          p(1, 1) = ca*sb
    1772     8300795 :          p(2, 1) = ca*cb
    1773     8300795 :          p(3, 1) = -sa
    1774     8300795 :          p(1, 2) = sa*sb
    1775     8300795 :          p(2, 2) = sa*cb
    1776     8300795 :          p(3, 2) = ca
    1777     8300795 :          p(1, 3) = cb
    1778     8300795 :          p(2, 3) = -sb
    1779     8300795 :          p(3, 3) = 0.0_dp
    1780     8300795 :          IF (sepi%dorb .OR. sepj%dorb) THEN
    1781       92548 :             ca2 = ca**2
    1782       92548 :             cb2 = cb**2
    1783       92548 :             sb2 = sb**2
    1784       92548 :             c2a = 2.0_dp*ca2 - 1.0_dp
    1785       92548 :             c2b = 2.0_dp*cb2 - 1.0_dp
    1786       92548 :             s2a = 2.0_dp*sa*ca
    1787       92548 :             s2b = 2.0_dp*sb*cb
    1788       92548 :             d(1, 1) = pt5sq3*c2a*sb2
    1789       92548 :             d(2, 1) = 0.5_dp*c2a*s2b
    1790       92548 :             d(3, 1) = -s2a*sb
    1791       92548 :             d(4, 1) = c2a*(cb2 + 0.5_dp*sb2)
    1792       92548 :             d(5, 1) = -s2a*cb
    1793       92548 :             d(1, 2) = pt5sq3*ca*s2b
    1794       92548 :             d(2, 2) = ca*c2b
    1795       92548 :             d(3, 2) = -sa*cb
    1796       92548 :             d(4, 2) = -0.5_dp*ca*s2b
    1797       92548 :             d(5, 2) = sa*sb
    1798       92548 :             d(1, 3) = cb2 - 0.5_dp*sb2
    1799       92548 :             d(2, 3) = -pt5sq3*s2b
    1800       92548 :             d(3, 3) = 0.0_dp
    1801       92548 :             d(4, 3) = pt5sq3*sb2
    1802       92548 :             d(5, 3) = 0.0_dp
    1803       92548 :             d(1, 4) = pt5sq3*sa*s2b
    1804       92548 :             d(2, 4) = sa*c2b
    1805       92548 :             d(3, 4) = ca*cb
    1806       92548 :             d(4, 4) = -0.5_dp*sa*s2b
    1807       92548 :             d(5, 4) = -ca*sb
    1808       92548 :             d(1, 5) = pt5sq3*s2a*sb2
    1809       92548 :             d(2, 5) = 0.5_dp*s2a*s2b
    1810       92548 :             d(3, 5) = c2a*sb
    1811       92548 :             d(4, 5) = s2a*(cb2 + 0.5_dp*sb2)
    1812       92548 :             d(5, 5) = c2a*cb
    1813             :          END IF
    1814             :          !  Rotation Elements for : S-P
    1815    33203180 :          DO k = 1, 3
    1816   107910335 :             DO l = 1, 3
    1817    99609540 :                ij_matrix%sp(k, l) = p(k, l)
    1818             :             END DO
    1819             :          END DO
    1820             :          !  Rotation Elements for : P-P
    1821    33203180 :          DO k = 1, 3
    1822    24902385 :             ij_matrix%pp(1, k, k) = p(k, 1)*p(k, 1)
    1823    24902385 :             ij_matrix%pp(2, k, k) = p(k, 2)*p(k, 2)
    1824    24902385 :             ij_matrix%pp(3, k, k) = p(k, 3)*p(k, 3)
    1825    24902385 :             ij_matrix%pp(4, k, k) = p(k, 1)*p(k, 2)
    1826    24902385 :             ij_matrix%pp(5, k, k) = p(k, 1)*p(k, 3)
    1827    24902385 :             ij_matrix%pp(6, k, k) = p(k, 2)*p(k, 3)
    1828    33203180 :             IF (k /= 1) THEN
    1829    41503975 :                DO l = 1, k - 1
    1830    24902385 :                   ij_matrix%pp(1, k, l) = 2.0_dp*p(k, 1)*p(l, 1)
    1831    24902385 :                   ij_matrix%pp(2, k, l) = 2.0_dp*p(k, 2)*p(l, 2)
    1832    24902385 :                   ij_matrix%pp(3, k, l) = 2.0_dp*p(k, 3)*p(l, 3)
    1833    24902385 :                   ij_matrix%pp(4, k, l) = p(k, 1)*p(l, 2) + p(k, 2)*p(l, 1)
    1834    24902385 :                   ij_matrix%pp(5, k, l) = p(k, 1)*p(l, 3) + p(k, 3)*p(l, 1)
    1835    41503975 :                   ij_matrix%pp(6, k, l) = p(k, 2)*p(l, 3) + p(k, 3)*p(l, 2)
    1836             :                END DO
    1837             :             END IF
    1838             :          END DO
    1839     8300795 :          IF (sepi%dorb .OR. sepj%dorb) THEN
    1840             :             !  Rotation Elements for : S-D
    1841      555288 :             DO k = 1, 5
    1842     2868988 :                DO l = 1, 5
    1843     2776440 :                   ij_matrix%sd(k, l) = d(k, l)
    1844             :                END DO
    1845             :             END DO
    1846             :             !  Rotation Elements for : D-P
    1847      555288 :             DO k = 1, 5
    1848     1943508 :                DO l = 1, 3
    1849     1388220 :                   ij_matrix%pd(1, k, l) = d(k, 1)*p(l, 1)
    1850     1388220 :                   ij_matrix%pd(2, k, l) = d(k, 1)*p(l, 2)
    1851     1388220 :                   ij_matrix%pd(3, k, l) = d(k, 1)*p(l, 3)
    1852     1388220 :                   ij_matrix%pd(4, k, l) = d(k, 2)*p(l, 1)
    1853     1388220 :                   ij_matrix%pd(5, k, l) = d(k, 2)*p(l, 2)
    1854     1388220 :                   ij_matrix%pd(6, k, l) = d(k, 2)*p(l, 3)
    1855     1388220 :                   ij_matrix%pd(7, k, l) = d(k, 3)*p(l, 1)
    1856     1388220 :                   ij_matrix%pd(8, k, l) = d(k, 3)*p(l, 2)
    1857     1388220 :                   ij_matrix%pd(9, k, l) = d(k, 3)*p(l, 3)
    1858     1388220 :                   ij_matrix%pd(10, k, l) = d(k, 4)*p(l, 1)
    1859     1388220 :                   ij_matrix%pd(11, k, l) = d(k, 4)*p(l, 2)
    1860     1388220 :                   ij_matrix%pd(12, k, l) = d(k, 4)*p(l, 3)
    1861     1388220 :                   ij_matrix%pd(13, k, l) = d(k, 5)*p(l, 1)
    1862     1388220 :                   ij_matrix%pd(14, k, l) = d(k, 5)*p(l, 2)
    1863     1850960 :                   ij_matrix%pd(15, k, l) = d(k, 5)*p(l, 3)
    1864             :                END DO
    1865             :             END DO
    1866             :             !  Rotation Elements for : D-D
    1867      555288 :             DO k = 1, 5
    1868      462740 :                ij_matrix%dd(1, k, k) = d(k, 1)*d(k, 1)
    1869      462740 :                ij_matrix%dd(2, k, k) = d(k, 2)*d(k, 2)
    1870      462740 :                ij_matrix%dd(3, k, k) = d(k, 3)*d(k, 3)
    1871      462740 :                ij_matrix%dd(4, k, k) = d(k, 4)*d(k, 4)
    1872      462740 :                ij_matrix%dd(5, k, k) = d(k, 5)*d(k, 5)
    1873      462740 :                ij_matrix%dd(6, k, k) = d(k, 1)*d(k, 2)
    1874      462740 :                ij_matrix%dd(7, k, k) = d(k, 1)*d(k, 3)
    1875      462740 :                ij_matrix%dd(8, k, k) = d(k, 2)*d(k, 3)
    1876      462740 :                ij_matrix%dd(9, k, k) = d(k, 1)*d(k, 4)
    1877      462740 :                ij_matrix%dd(10, k, k) = d(k, 2)*d(k, 4)
    1878      462740 :                ij_matrix%dd(11, k, k) = d(k, 3)*d(k, 4)
    1879      462740 :                ij_matrix%dd(12, k, k) = d(k, 1)*d(k, 5)
    1880      462740 :                ij_matrix%dd(13, k, k) = d(k, 2)*d(k, 5)
    1881      462740 :                ij_matrix%dd(14, k, k) = d(k, 3)*d(k, 5)
    1882      462740 :                ij_matrix%dd(15, k, k) = d(k, 4)*d(k, 5)
    1883     8763535 :                IF (k /= 1) THEN
    1884     1295672 :                   DO l = 1, k - 1
    1885      925480 :                      ij_matrix%dd(1, k, l) = 2.0_dp*d(k, 1)*d(l, 1)
    1886      925480 :                      ij_matrix%dd(2, k, l) = 2.0_dp*d(k, 2)*d(l, 2)
    1887      925480 :                      ij_matrix%dd(3, k, l) = 2.0_dp*d(k, 3)*d(l, 3)
    1888      925480 :                      ij_matrix%dd(4, k, l) = 2.0_dp*d(k, 4)*d(l, 4)
    1889      925480 :                      ij_matrix%dd(5, k, l) = 2.0_dp*d(k, 5)*d(l, 5)
    1890      925480 :                      ij_matrix%dd(6, k, l) = d(k, 1)*d(l, 2) + d(k, 2)*d(l, 1)
    1891      925480 :                      ij_matrix%dd(7, k, l) = d(k, 1)*d(l, 3) + d(k, 3)*d(l, 1)
    1892      925480 :                      ij_matrix%dd(8, k, l) = d(k, 2)*d(l, 3) + d(k, 3)*d(l, 2)
    1893      925480 :                      ij_matrix%dd(9, k, l) = d(k, 1)*d(l, 4) + d(k, 4)*d(l, 1)
    1894      925480 :                      ij_matrix%dd(10, k, l) = d(k, 2)*d(l, 4) + d(k, 4)*d(l, 2)
    1895      925480 :                      ij_matrix%dd(11, k, l) = d(k, 3)*d(l, 4) + d(k, 4)*d(l, 3)
    1896      925480 :                      ij_matrix%dd(12, k, l) = d(k, 1)*d(l, 5) + d(k, 5)*d(l, 1)
    1897      925480 :                      ij_matrix%dd(13, k, l) = d(k, 2)*d(l, 5) + d(k, 5)*d(l, 2)
    1898      925480 :                      ij_matrix%dd(14, k, l) = d(k, 3)*d(l, 5) + d(k, 5)*d(l, 3)
    1899     1295672 :                      ij_matrix%dd(15, k, l) = d(k, 4)*d(l, 5) + d(k, 5)*d(l, 4)
    1900             :                   END DO
    1901             :                END IF
    1902             :             END DO
    1903             :          END IF
    1904             :          ! Evaluate Derivatives if required
    1905     8300795 :          IF (do_derivatives) THEN
    1906             :             ! This condition is necessary because derivatives uses the invertion of the
    1907             :             ! axis for treating the divergence point along z-axis
    1908     4044956 :             CPASSERT(eval)
    1909     4044956 :             x11_d = 0.0_dp; x11_d(1) = 1.0_dp
    1910     4044956 :             x22_d = 0.0_dp; x22_d(2) = 1.0_dp
    1911     4044956 :             x33_d = 0.0_dp; x33_d(3) = 1.0_dp
    1912    16179824 :             r_d = (/x11, x22, x33/)/r
    1913    16179824 :             b_d = 2.0_dp*(x11*x11_d + x22*x22_d)
    1914    16179824 :             sqb_d = (0.5_dp/sqb)*b_d
    1915     4044956 :             r2i = 1.0_dp/r**2
    1916     4044956 :             sqb2i = 1.0_dp/sqb**2
    1917    16179824 :             cb_d = (x33_d*r - x33*r_d)*r2i
    1918    16179824 :             ca_d = (x11_d*sqb - x11*sqb_d)*sqb2i
    1919    16179824 :             sa_d = (x22_d*sqb - x22*sqb_d)*sqb2i
    1920    16179824 :             sb_d = (sqb_d*r - sqb*r_d)*r2i
    1921             :             ! Calculate derivatives of rotation matrix elements
    1922    16179824 :             p_d(:, 1, 1) = ca_d*sb + ca*sb_d
    1923    16179824 :             p_d(:, 2, 1) = ca_d*cb + ca*cb_d
    1924    16179824 :             p_d(:, 3, 1) = -sa_d
    1925    16179824 :             p_d(:, 1, 2) = sa_d*sb + sa*sb_d
    1926    16179824 :             p_d(:, 2, 2) = sa_d*cb + sa*cb_d
    1927    16179824 :             p_d(:, 3, 2) = ca_d
    1928    16179824 :             p_d(:, 1, 3) = cb_d
    1929    16179824 :             p_d(:, 2, 3) = -sb_d
    1930    16179824 :             p_d(:, 3, 3) = 0.0_dp
    1931     4044956 :             IF (sepi%dorb .OR. sepj%dorb) THEN
    1932      171240 :                ca2_d = 2.0_dp*ca*ca_d
    1933      171240 :                cb2_d = 2.0_dp*cb*cb_d
    1934      171240 :                sb2_d = 2.0_dp*sb*sb_d
    1935      171240 :                c2a_d = 2.0_dp*ca2_d
    1936      171240 :                c2b_d = 2.0_dp*cb2_d
    1937      171240 :                s2a_d = 2.0_dp*(sa_d*ca + sa*ca_d)
    1938      171240 :                s2b_d = 2.0_dp*(sb_d*cb + sb*cb_d)
    1939      171240 :                d_d(:, 1, 1) = pt5sq3*(c2a_d*sb2 + c2a*sb2_d)
    1940      171240 :                d_d(:, 2, 1) = 0.5_dp*(c2a_d*s2b + c2a*s2b_d)
    1941      171240 :                d_d(:, 3, 1) = -s2a_d*sb - s2a*sb_d
    1942      171240 :                d_d(:, 4, 1) = c2a_d*(cb2 + 0.5_dp*sb2) + c2a*(cb2_d + 0.5_dp*sb2_d)
    1943      171240 :                d_d(:, 5, 1) = -s2a_d*cb - s2a*cb_d
    1944      171240 :                d_d(:, 1, 2) = pt5sq3*(ca_d*s2b + ca*s2b_d)
    1945      171240 :                d_d(:, 2, 2) = ca_d*c2b + ca*c2b_d
    1946      171240 :                d_d(:, 3, 2) = -sa_d*cb - sa*cb_d
    1947      171240 :                d_d(:, 4, 2) = -0.5_dp*(ca_d*s2b + ca*s2b_d)
    1948      171240 :                d_d(:, 5, 2) = sa_d*sb + sa*sb_d
    1949      171240 :                d_d(:, 1, 3) = cb2_d - 0.5_dp*sb2_d
    1950      171240 :                d_d(:, 2, 3) = -pt5sq3*s2b_d
    1951      171240 :                d_d(:, 3, 3) = 0.0_dp
    1952      171240 :                d_d(:, 4, 3) = pt5sq3*sb2_d
    1953      171240 :                d_d(:, 5, 3) = 0.0_dp
    1954      171240 :                d_d(:, 1, 4) = pt5sq3*(sa_d*s2b + sa*s2b_d)
    1955      171240 :                d_d(:, 2, 4) = sa_d*c2b + sa*c2b_d
    1956      171240 :                d_d(:, 3, 4) = ca_d*cb + ca*cb_d
    1957      171240 :                d_d(:, 4, 4) = -0.5_dp*(sa_d*s2b + sa*s2b_d)
    1958      171240 :                d_d(:, 5, 4) = -ca_d*sb - ca*sb_d
    1959      171240 :                d_d(:, 1, 5) = pt5sq3*(s2a_d*sb2 + s2a*sb2_d)
    1960      171240 :                d_d(:, 2, 5) = 0.5_dp*(s2a_d*s2b + s2a*s2b_d)
    1961      171240 :                d_d(:, 3, 5) = c2a_d*sb + c2a*sb_d
    1962      171240 :                d_d(:, 4, 5) = s2a_d*(cb2 + 0.5_dp*sb2) + s2a*(cb2_d + 0.5_dp*sb2_d)
    1963     4173386 :                d_d(:, 5, 5) = c2a_d*cb + c2a*cb_d
    1964             :             END IF
    1965             :             !  Derivative for Rotation Elements for : S-P
    1966    16179824 :             DO k = 1, 3
    1967    52584428 :                DO l = 1, 3
    1968   157753284 :                   ij_matrix%sp_d(:, k, l) = p_d(:, k, l)
    1969             :                END DO
    1970             :             END DO
    1971             :             !  Derivative for Rotation Elements for : P-P
    1972    16179824 :             DO k = 1, 3
    1973    48539472 :                ij_matrix%pp_d(:, 1, k, k) = p_d(:, k, 1)*p(k, 1) + p(k, 1)*p_d(:, k, 1)
    1974    48539472 :                ij_matrix%pp_d(:, 2, k, k) = p_d(:, k, 2)*p(k, 2) + p(k, 2)*p_d(:, k, 2)
    1975    48539472 :                ij_matrix%pp_d(:, 3, k, k) = p_d(:, k, 3)*p(k, 3) + p(k, 3)*p_d(:, k, 3)
    1976    48539472 :                ij_matrix%pp_d(:, 4, k, k) = p_d(:, k, 1)*p(k, 2) + p(k, 1)*p_d(:, k, 2)
    1977    48539472 :                ij_matrix%pp_d(:, 5, k, k) = p_d(:, k, 1)*p(k, 3) + p(k, 1)*p_d(:, k, 3)
    1978    48539472 :                ij_matrix%pp_d(:, 6, k, k) = p_d(:, k, 2)*p(k, 3) + p(k, 2)*p_d(:, k, 3)
    1979    16179824 :                IF (k /= 1) THEN
    1980    20224780 :                   DO l = 1, k - 1
    1981    48539472 :                      ij_matrix%pp_d(:, 1, k, l) = 2.0_dp*(p_d(:, k, 1)*p(l, 1) + p(k, 1)*p_d(:, l, 1))
    1982    48539472 :                      ij_matrix%pp_d(:, 2, k, l) = 2.0_dp*(p_d(:, k, 2)*p(l, 2) + p(k, 2)*p_d(:, l, 2))
    1983    48539472 :                      ij_matrix%pp_d(:, 3, k, l) = 2.0_dp*(p_d(:, k, 3)*p(l, 3) + p(k, 3)*p_d(:, l, 3))
    1984             :                      ij_matrix%pp_d(:, 4, k, l) = (p_d(:, k, 1)*p(l, 2) + p(k, 1)*p_d(:, l, 2)) + &
    1985    48539472 :                                                   (p_d(:, k, 2)*p(l, 1) + p(k, 2)*p_d(:, l, 1))
    1986             :                      ij_matrix%pp_d(:, 5, k, l) = (p_d(:, k, 1)*p(l, 3) + p(k, 1)*p_d(:, l, 3)) + &
    1987    48539472 :                                                   (p_d(:, k, 3)*p(l, 1) + p(k, 3)*p_d(:, l, 1))
    1988             :                      ij_matrix%pp_d(:, 6, k, l) = (p_d(:, k, 2)*p(l, 3) + p(k, 2)*p_d(:, l, 3)) + &
    1989    56629384 :                                                   (p_d(:, k, 3)*p(l, 2) + p(k, 3)*p_d(:, l, 2))
    1990             :                   END DO
    1991             :                END IF
    1992             :             END DO
    1993     4044956 :             IF (sepi%dorb .OR. sepj%dorb) THEN
    1994             :                !  Rotation Elements for : S-D
    1995      256860 :                DO k = 1, 5
    1996     1327110 :                   DO l = 1, 5
    1997     4495050 :                      ij_matrix%sd_d(:, k, l) = d_d(:, k, l)
    1998             :                   END DO
    1999             :                END DO
    2000             :                !  Rotation Elements for : D-P
    2001      256860 :                DO k = 1, 5
    2002      899010 :                   DO l = 1, 3
    2003     2568600 :                      ij_matrix%pd_d(:, 1, k, l) = (d_d(:, k, 1)*p(l, 1) + d(k, 1)*p_d(:, l, 1))
    2004     2568600 :                      ij_matrix%pd_d(:, 2, k, l) = (d_d(:, k, 1)*p(l, 2) + d(k, 1)*p_d(:, l, 2))
    2005     2568600 :                      ij_matrix%pd_d(:, 3, k, l) = (d_d(:, k, 1)*p(l, 3) + d(k, 1)*p_d(:, l, 3))
    2006     2568600 :                      ij_matrix%pd_d(:, 4, k, l) = (d_d(:, k, 2)*p(l, 1) + d(k, 2)*p_d(:, l, 1))
    2007     2568600 :                      ij_matrix%pd_d(:, 5, k, l) = (d_d(:, k, 2)*p(l, 2) + d(k, 2)*p_d(:, l, 2))
    2008     2568600 :                      ij_matrix%pd_d(:, 6, k, l) = (d_d(:, k, 2)*p(l, 3) + d(k, 2)*p_d(:, l, 3))
    2009     2568600 :                      ij_matrix%pd_d(:, 7, k, l) = (d_d(:, k, 3)*p(l, 1) + d(k, 3)*p_d(:, l, 1))
    2010     2568600 :                      ij_matrix%pd_d(:, 8, k, l) = (d_d(:, k, 3)*p(l, 2) + d(k, 3)*p_d(:, l, 2))
    2011     2568600 :                      ij_matrix%pd_d(:, 9, k, l) = (d_d(:, k, 3)*p(l, 3) + d(k, 3)*p_d(:, l, 3))
    2012     2568600 :                      ij_matrix%pd_d(:, 10, k, l) = (d_d(:, k, 4)*p(l, 1) + d(k, 4)*p_d(:, l, 1))
    2013     2568600 :                      ij_matrix%pd_d(:, 11, k, l) = (d_d(:, k, 4)*p(l, 2) + d(k, 4)*p_d(:, l, 2))
    2014     2568600 :                      ij_matrix%pd_d(:, 12, k, l) = (d_d(:, k, 4)*p(l, 3) + d(k, 4)*p_d(:, l, 3))
    2015     2568600 :                      ij_matrix%pd_d(:, 13, k, l) = (d_d(:, k, 5)*p(l, 1) + d(k, 5)*p_d(:, l, 1))
    2016     2568600 :                      ij_matrix%pd_d(:, 14, k, l) = (d_d(:, k, 5)*p(l, 2) + d(k, 5)*p_d(:, l, 2))
    2017     2782650 :                      ij_matrix%pd_d(:, 15, k, l) = (d_d(:, k, 5)*p(l, 3) + d(k, 5)*p_d(:, l, 3))
    2018             :                   END DO
    2019             :                END DO
    2020             :                !  Rotation Elements for : D-D
    2021      256860 :                DO k = 1, 5
    2022      856200 :                   ij_matrix%dd_d(:, 1, k, k) = (d_d(:, k, 1)*d(k, 1) + d(k, 1)*d_d(:, k, 1))
    2023      856200 :                   ij_matrix%dd_d(:, 2, k, k) = (d_d(:, k, 2)*d(k, 2) + d(k, 2)*d_d(:, k, 2))
    2024      856200 :                   ij_matrix%dd_d(:, 3, k, k) = (d_d(:, k, 3)*d(k, 3) + d(k, 3)*d_d(:, k, 3))
    2025      856200 :                   ij_matrix%dd_d(:, 4, k, k) = (d_d(:, k, 4)*d(k, 4) + d(k, 4)*d_d(:, k, 4))
    2026      856200 :                   ij_matrix%dd_d(:, 5, k, k) = (d_d(:, k, 5)*d(k, 5) + d(k, 5)*d_d(:, k, 5))
    2027      856200 :                   ij_matrix%dd_d(:, 6, k, k) = (d_d(:, k, 1)*d(k, 2) + d(k, 1)*d_d(:, k, 2))
    2028      856200 :                   ij_matrix%dd_d(:, 7, k, k) = (d_d(:, k, 1)*d(k, 3) + d(k, 1)*d_d(:, k, 3))
    2029      856200 :                   ij_matrix%dd_d(:, 8, k, k) = (d_d(:, k, 2)*d(k, 3) + d(k, 2)*d_d(:, k, 3))
    2030      856200 :                   ij_matrix%dd_d(:, 9, k, k) = (d_d(:, k, 1)*d(k, 4) + d(k, 1)*d_d(:, k, 4))
    2031      856200 :                   ij_matrix%dd_d(:, 10, k, k) = (d_d(:, k, 2)*d(k, 4) + d(k, 2)*d_d(:, k, 4))
    2032      856200 :                   ij_matrix%dd_d(:, 11, k, k) = (d_d(:, k, 3)*d(k, 4) + d(k, 3)*d_d(:, k, 4))
    2033      856200 :                   ij_matrix%dd_d(:, 12, k, k) = (d_d(:, k, 1)*d(k, 5) + d(k, 1)*d_d(:, k, 5))
    2034      856200 :                   ij_matrix%dd_d(:, 13, k, k) = (d_d(:, k, 2)*d(k, 5) + d(k, 2)*d_d(:, k, 5))
    2035      856200 :                   ij_matrix%dd_d(:, 14, k, k) = (d_d(:, k, 3)*d(k, 5) + d(k, 3)*d_d(:, k, 5))
    2036      856200 :                   ij_matrix%dd_d(:, 15, k, k) = (d_d(:, k, 4)*d(k, 5) + d(k, 4)*d_d(:, k, 5))
    2037     4259006 :                   IF (k /= 1) THEN
    2038      599340 :                      DO l = 1, k - 1
    2039     1712400 :                         ij_matrix%dd_d(:, 1, k, l) = 2.0_dp*(d_d(:, k, 1)*d(l, 1) + d(k, 1)*d_d(:, l, 1))
    2040     1712400 :                         ij_matrix%dd_d(:, 2, k, l) = 2.0_dp*(d_d(:, k, 2)*d(l, 2) + d(k, 2)*d_d(:, l, 2))
    2041     1712400 :                         ij_matrix%dd_d(:, 3, k, l) = 2.0_dp*(d_d(:, k, 3)*d(l, 3) + d(k, 3)*d_d(:, l, 3))
    2042     1712400 :                         ij_matrix%dd_d(:, 4, k, l) = 2.0_dp*(d_d(:, k, 4)*d(l, 4) + d(k, 4)*d_d(:, l, 4))
    2043     1712400 :                         ij_matrix%dd_d(:, 5, k, l) = 2.0_dp*(d_d(:, k, 5)*d(l, 5) + d(k, 5)*d_d(:, l, 5))
    2044             :                         ij_matrix%dd_d(:, 6, k, l) = (d_d(:, k, 1)*d(l, 2) + d(k, 1)*d_d(:, l, 2)) + &
    2045     1712400 :                                                      (d_d(:, k, 2)*d(l, 1) + d(k, 2)*d_d(:, l, 1))
    2046             :                         ij_matrix%dd_d(:, 7, k, l) = (d_d(:, k, 1)*d(l, 3) + d(k, 1)*d_d(:, l, 3)) + &
    2047     1712400 :                                                      (d_d(:, k, 3)*d(l, 1) + d(k, 3)*d_d(:, l, 1))
    2048             :                         ij_matrix%dd_d(:, 8, k, l) = (d_d(:, k, 2)*d(l, 3) + d(k, 2)*d_d(:, l, 3)) + &
    2049     1712400 :                                                      (d_d(:, k, 3)*d(l, 2) + d(k, 3)*d_d(:, l, 2))
    2050             :                         ij_matrix%dd_d(:, 9, k, l) = (d_d(:, k, 1)*d(l, 4) + d(k, 1)*d_d(:, l, 4)) + &
    2051     1712400 :                                                      (d_d(:, k, 4)*d(l, 1) + d(k, 4)*d_d(:, l, 1))
    2052             :                         ij_matrix%dd_d(:, 10, k, l) = (d_d(:, k, 2)*d(l, 4) + d(k, 2)*d_d(:, l, 4)) + &
    2053     1712400 :                                                       (d_d(:, k, 4)*d(l, 2) + d(k, 4)*d_d(:, l, 2))
    2054             :                         ij_matrix%dd_d(:, 11, k, l) = (d_d(:, k, 3)*d(l, 4) + d(k, 3)*d_d(:, l, 4)) + &
    2055     1712400 :                                                       (d_d(:, k, 4)*d(l, 3) + d(k, 4)*d_d(:, l, 3))
    2056             :                         ij_matrix%dd_d(:, 12, k, l) = (d_d(:, k, 1)*d(l, 5) + d(k, 1)*d_d(:, l, 5)) + &
    2057     1712400 :                                                       (d_d(:, k, 5)*d(l, 1) + d(k, 5)*d_d(:, l, 1))
    2058             :                         ij_matrix%dd_d(:, 13, k, l) = (d_d(:, k, 2)*d(l, 5) + d(k, 2)*d_d(:, l, 5)) + &
    2059     1712400 :                                                       (d_d(:, k, 5)*d(l, 2) + d(k, 5)*d_d(:, l, 2))
    2060             :                         ij_matrix%dd_d(:, 14, k, l) = (d_d(:, k, 3)*d(l, 5) + d(k, 3)*d_d(:, l, 5)) + &
    2061     1712400 :                                                       (d_d(:, k, 5)*d(l, 3) + d(k, 5)*d_d(:, l, 3))
    2062             :                         ij_matrix%dd_d(:, 15, k, l) = (d_d(:, k, 4)*d(l, 5) + d(k, 4)*d_d(:, l, 5)) + &
    2063     1883640 :                                                       (d_d(:, k, 5)*d(l, 4) + d(k, 5)*d_d(:, l, 4))
    2064             :                      END DO
    2065             :                   END IF
    2066             :                END DO
    2067             :             END IF
    2068             :             IF (debug_this_module) THEN
    2069             :                CALL check_rotmat_der(sepi, sepj, rjiv, ij_matrix, do_invert=do_invert)
    2070             :             END IF
    2071             :          END IF
    2072             :       END IF
    2073    17364991 :    END SUBROUTINE rotmat
    2074             : 
    2075             : ! **************************************************************************************************
    2076             : !> \brief First Step of the rotation of the two-electron two-center integrals in
    2077             : !>        SPD basis
    2078             : !>
    2079             : !> \param sepi ...
    2080             : !> \param sepj ...
    2081             : !> \param rijv ...
    2082             : !> \param se_int_control ...
    2083             : !> \param se_taper ...
    2084             : !> \param invert ...
    2085             : !> \param ii ...
    2086             : !> \param kk ...
    2087             : !> \param rep ...
    2088             : !> \param logv ...
    2089             : !> \param ij_matrix ...
    2090             : !> \param v ...
    2091             : !> \param lgrad ...
    2092             : !> \param rep_d ...
    2093             : !> \param v_d ...
    2094             : !> \param logv_d ...
    2095             : !> \param drij ...
    2096             : !> \date 04.2008 [tlaino]
    2097             : !> \author Teodoro Laino [tlaino] - University of Zurich
    2098             : ! **************************************************************************************************
    2099     1195735 :    RECURSIVE SUBROUTINE rot_2el_2c_first(sepi, sepj, rijv, se_int_control, se_taper, &
    2100             :                                          invert, ii, kk, rep, logv, ij_matrix, v, lgrad, rep_d, v_d, logv_d, drij)
    2101             :       TYPE(semi_empirical_type), POINTER                 :: sepi, sepj
    2102             :       REAL(KIND=dp), DIMENSION(3), INTENT(IN)            :: rijv
    2103             :       TYPE(se_int_control_type), INTENT(IN)              :: se_int_control
    2104             :       TYPE(se_taper_type), POINTER                       :: se_taper
    2105             :       LOGICAL, INTENT(IN)                                :: invert
    2106             :       INTEGER, INTENT(IN)                                :: ii, kk
    2107             :       REAL(KIND=dp), DIMENSION(491), INTENT(IN)          :: rep
    2108             :       LOGICAL, DIMENSION(45, 45), INTENT(OUT)            :: logv
    2109             :       TYPE(rotmat_type), POINTER                         :: ij_matrix
    2110             :       REAL(KIND=dp), DIMENSION(45, 45), INTENT(OUT)      :: v
    2111             :       LOGICAL, INTENT(IN)                                :: lgrad
    2112             :       REAL(KIND=dp), DIMENSION(491), INTENT(IN), &
    2113             :          OPTIONAL                                        :: rep_d
    2114             :       REAL(KIND=dp), DIMENSION(3, 45, 45), INTENT(OUT), &
    2115             :          OPTIONAL                                        :: v_d
    2116             :       LOGICAL, DIMENSION(45, 45), INTENT(OUT), OPTIONAL  :: logv_d
    2117             :       REAL(KIND=dp), DIMENSION(3), INTENT(IN), OPTIONAL  :: drij
    2118             : 
    2119             :       INTEGER                                            :: i, i1, ij, j1, k, k1, kl, l, l1, limkl, &
    2120             :                                                             ll, mm, nd
    2121             :       REAL(KIND=dp)                                      :: wrepp, wrepp_d(3)
    2122             : 
    2123     1195735 :       IF (lgrad) THEN
    2124      511306 :          CPASSERT(PRESENT(rep_d))
    2125      511306 :          CPASSERT(PRESENT(v_d))
    2126      511306 :          CPASSERT(PRESENT(logv_d))
    2127      511306 :          CPASSERT(PRESENT(drij))
    2128             :       END IF
    2129     1195735 :       limkl = indexb(kk, kk)
    2130     8231336 :       DO k = 1, limkl
    2131   324833381 :          DO i = 1, 45
    2132   316602045 :             logv(i, k) = .FALSE.
    2133   323637646 :             v(i, k) = 0.0_dp
    2134             :          END DO
    2135             :       END DO
    2136             :       !
    2137     4684623 :       DO i1 = 1, ii
    2138    13422257 :          DO j1 = 1, i1
    2139     8737634 :             ij = indexa(i1, j1)
    2140             :             !
    2141    33847168 :             DO k1 = 1, kk
    2142             :                !
    2143   100361142 :                DO l1 = 1, k1
    2144    66513974 :                   kl = indexa(k1, l1)
    2145    66513974 :                   nd = ijkl_ind(ij, kl)
    2146    91623508 :                   IF (nd /= 0) THEN
    2147             :                      !
    2148    21392781 :                      wrepp = rep(nd)
    2149    21392781 :                      ll = indexb(k1, l1)
    2150    21392781 :                      mm = int2c_type(ll)
    2151             :                      !
    2152             :                      IF (mm == 1) THEN
    2153     4330557 :                         v(ij, 1) = wrepp
    2154             :                      ELSE IF (mm == 2) THEN
    2155     4121126 :                         k = k1 - 1
    2156     4121126 :                         v(ij, 2) = v(ij, 2) + ij_matrix%sp(k, 1)*wrepp
    2157     4121126 :                         v(ij, 4) = v(ij, 4) + ij_matrix%sp(k, 2)*wrepp
    2158     4121126 :                         v(ij, 7) = v(ij, 7) + ij_matrix%sp(k, 3)*wrepp
    2159             :                      ELSE IF (mm == 3) THEN
    2160     9277700 :                         k = k1 - 1
    2161     9277700 :                         l = l1 - 1
    2162     9277700 :                         v(ij, 3) = v(ij, 3) + ij_matrix%pp(1, k, l)*wrepp
    2163     9277700 :                         v(ij, 6) = v(ij, 6) + ij_matrix%pp(2, k, l)*wrepp
    2164     9277700 :                         v(ij, 10) = v(ij, 10) + ij_matrix%pp(3, k, l)*wrepp
    2165     9277700 :                         v(ij, 5) = v(ij, 5) + ij_matrix%pp(4, k, l)*wrepp
    2166     9277700 :                         v(ij, 8) = v(ij, 8) + ij_matrix%pp(5, k, l)*wrepp
    2167     9277700 :                         v(ij, 9) = v(ij, 9) + ij_matrix%pp(6, k, l)*wrepp
    2168             :                      ELSE IF (mm == 4) THEN
    2169      495092 :                         k = k1 - 4
    2170      495092 :                         v(ij, 11) = v(ij, 11) + ij_matrix%sd(k, 1)*wrepp
    2171      495092 :                         v(ij, 16) = v(ij, 16) + ij_matrix%sd(k, 2)*wrepp
    2172      495092 :                         v(ij, 22) = v(ij, 22) + ij_matrix%sd(k, 3)*wrepp
    2173      495092 :                         v(ij, 29) = v(ij, 29) + ij_matrix%sd(k, 4)*wrepp
    2174      495092 :                         v(ij, 37) = v(ij, 37) + ij_matrix%sd(k, 5)*wrepp
    2175             :                      ELSE IF (mm == 5) THEN
    2176     1532316 :                         k = k1 - 4
    2177     1532316 :                         l = l1 - 1
    2178     1532316 :                         v(ij, 12) = v(ij, 12) + ij_matrix%pd(1, k, l)*wrepp
    2179     1532316 :                         v(ij, 13) = v(ij, 13) + ij_matrix%pd(2, k, l)*wrepp
    2180     1532316 :                         v(ij, 14) = v(ij, 14) + ij_matrix%pd(3, k, l)*wrepp
    2181     1532316 :                         v(ij, 17) = v(ij, 17) + ij_matrix%pd(4, k, l)*wrepp
    2182     1532316 :                         v(ij, 18) = v(ij, 18) + ij_matrix%pd(5, k, l)*wrepp
    2183     1532316 :                         v(ij, 19) = v(ij, 19) + ij_matrix%pd(6, k, l)*wrepp
    2184     1532316 :                         v(ij, 23) = v(ij, 23) + ij_matrix%pd(7, k, l)*wrepp
    2185     1532316 :                         v(ij, 24) = v(ij, 24) + ij_matrix%pd(8, k, l)*wrepp
    2186     1532316 :                         v(ij, 25) = v(ij, 25) + ij_matrix%pd(9, k, l)*wrepp
    2187     1532316 :                         v(ij, 30) = v(ij, 30) + ij_matrix%pd(10, k, l)*wrepp
    2188     1532316 :                         v(ij, 31) = v(ij, 31) + ij_matrix%pd(11, k, l)*wrepp
    2189     1532316 :                         v(ij, 32) = v(ij, 32) + ij_matrix%pd(12, k, l)*wrepp
    2190     1532316 :                         v(ij, 38) = v(ij, 38) + ij_matrix%pd(13, k, l)*wrepp
    2191     1532316 :                         v(ij, 39) = v(ij, 39) + ij_matrix%pd(14, k, l)*wrepp
    2192     1532316 :                         v(ij, 40) = v(ij, 40) + ij_matrix%pd(15, k, l)*wrepp
    2193             :                      ELSE IF (mm == 6) THEN
    2194     1635990 :                         k = k1 - 4
    2195     1635990 :                         l = l1 - 4
    2196     1635990 :                         v(ij, 15) = v(ij, 15) + ij_matrix%dd(1, k, l)*wrepp
    2197     1635990 :                         v(ij, 21) = v(ij, 21) + ij_matrix%dd(2, k, l)*wrepp
    2198     1635990 :                         v(ij, 28) = v(ij, 28) + ij_matrix%dd(3, k, l)*wrepp
    2199     1635990 :                         v(ij, 36) = v(ij, 36) + ij_matrix%dd(4, k, l)*wrepp
    2200     1635990 :                         v(ij, 45) = v(ij, 45) + ij_matrix%dd(5, k, l)*wrepp
    2201     1635990 :                         v(ij, 20) = v(ij, 20) + ij_matrix%dd(6, k, l)*wrepp
    2202     1635990 :                         v(ij, 26) = v(ij, 26) + ij_matrix%dd(7, k, l)*wrepp
    2203     1635990 :                         v(ij, 27) = v(ij, 27) + ij_matrix%dd(8, k, l)*wrepp
    2204     1635990 :                         v(ij, 33) = v(ij, 33) + ij_matrix%dd(9, k, l)*wrepp
    2205     1635990 :                         v(ij, 34) = v(ij, 34) + ij_matrix%dd(10, k, l)*wrepp
    2206     1635990 :                         v(ij, 35) = v(ij, 35) + ij_matrix%dd(11, k, l)*wrepp
    2207     1635990 :                         v(ij, 41) = v(ij, 41) + ij_matrix%dd(12, k, l)*wrepp
    2208     1635990 :                         v(ij, 42) = v(ij, 42) + ij_matrix%dd(13, k, l)*wrepp
    2209     1635990 :                         v(ij, 43) = v(ij, 43) + ij_matrix%dd(14, k, l)*wrepp
    2210     1635990 :                         v(ij, 44) = v(ij, 44) + ij_matrix%dd(15, k, l)*wrepp
    2211             :                      END IF
    2212             :                   END IF
    2213             :                END DO
    2214             :             END DO
    2215    78740496 :             DO kl = 1, limkl
    2216    75251608 :                logv(ij, kl) = (ABS(v(ij, kl)) > 0.0_dp)
    2217             :             END DO
    2218             :          END DO
    2219             :       END DO
    2220             :       ! Gradients
    2221     1195735 :       IF (lgrad) THEN
    2222     3642985 :          DO k = 1, limkl
    2223   144568540 :             DO i = 1, 45
    2224   140925555 :                logv_d(i, k) = .FALSE.
    2225   140925555 :                v_d(1, i, k) = 0.0_dp
    2226   140925555 :                v_d(2, i, k) = 0.0_dp
    2227   144057234 :                v_d(3, i, k) = 0.0_dp
    2228             :             END DO
    2229             :          END DO
    2230     2018237 :          DO i1 = 1, ii
    2231     5821698 :             DO j1 = 1, i1
    2232     3803461 :                ij = indexa(i1, j1)
    2233             :                !
    2234    15073799 :                DO k1 = 1, kk
    2235             :                   !
    2236    45478491 :                   DO l1 = 1, k1
    2237    30404692 :                      kl = indexa(k1, l1)
    2238    30404692 :                      nd = ijkl_ind(ij, kl)
    2239    41675030 :                      IF (nd /= 0) THEN
    2240             :                         !
    2241     9688399 :                         wrepp = rep(nd)
    2242    38753596 :                         wrepp_d = rep_d(nd)*drij
    2243     9688399 :                         ll = indexb(k1, l1)
    2244     9688399 :                         mm = int2c_type(ll)
    2245             :                         !
    2246             :                         IF (mm == 1) THEN
    2247     1874422 :                            v_d(1, ij, 1) = wrepp_d(1)
    2248     1874422 :                            v_d(2, ij, 1) = wrepp_d(2)
    2249     1874422 :                            v_d(3, ij, 1) = wrepp_d(3)
    2250             :                         ELSE IF (mm == 2) THEN
    2251     1857556 :                            k = k1 - 1
    2252     1857556 :                            v_d(1, ij, 2) = v_d(1, ij, 2) + ij_matrix%sp_d(1, k, 1)*wrepp + ij_matrix%sp(k, 1)*wrepp_d(1)
    2253     1857556 :                            v_d(1, ij, 4) = v_d(1, ij, 4) + ij_matrix%sp_d(1, k, 2)*wrepp + ij_matrix%sp(k, 2)*wrepp_d(1)
    2254     1857556 :                            v_d(1, ij, 7) = v_d(1, ij, 7) + ij_matrix%sp_d(1, k, 3)*wrepp + ij_matrix%sp(k, 3)*wrepp_d(1)
    2255             : 
    2256     1857556 :                            v_d(2, ij, 2) = v_d(2, ij, 2) + ij_matrix%sp_d(2, k, 1)*wrepp + ij_matrix%sp(k, 1)*wrepp_d(2)
    2257     1857556 :                            v_d(2, ij, 4) = v_d(2, ij, 4) + ij_matrix%sp_d(2, k, 2)*wrepp + ij_matrix%sp(k, 2)*wrepp_d(2)
    2258     1857556 :                            v_d(2, ij, 7) = v_d(2, ij, 7) + ij_matrix%sp_d(2, k, 3)*wrepp + ij_matrix%sp(k, 3)*wrepp_d(2)
    2259             : 
    2260     1857556 :                            v_d(3, ij, 2) = v_d(3, ij, 2) + ij_matrix%sp_d(3, k, 1)*wrepp + ij_matrix%sp(k, 1)*wrepp_d(3)
    2261     1857556 :                            v_d(3, ij, 4) = v_d(3, ij, 4) + ij_matrix%sp_d(3, k, 2)*wrepp + ij_matrix%sp(k, 2)*wrepp_d(3)
    2262     1857556 :                            v_d(3, ij, 7) = v_d(3, ij, 7) + ij_matrix%sp_d(3, k, 3)*wrepp + ij_matrix%sp(k, 3)*wrepp_d(3)
    2263             :                         ELSE IF (mm == 3) THEN
    2264     4179597 :                            k = k1 - 1
    2265     4179597 :                            l = l1 - 1
    2266     4179597 :                            v_d(1, ij, 3) = v_d(1, ij, 3) + ij_matrix%pp_d(1, 1, k, l)*wrepp + ij_matrix%pp(1, k, l)*wrepp_d(1)
    2267     4179597 :                            v_d(1, ij, 6) = v_d(1, ij, 6) + ij_matrix%pp_d(1, 2, k, l)*wrepp + ij_matrix%pp(2, k, l)*wrepp_d(1)
    2268     4179597 :                            v_d(1, ij, 10) = v_d(1, ij, 10) + ij_matrix%pp_d(1, 3, k, l)*wrepp + ij_matrix%pp(3, k, l)*wrepp_d(1)
    2269     4179597 :                            v_d(1, ij, 5) = v_d(1, ij, 5) + ij_matrix%pp_d(1, 4, k, l)*wrepp + ij_matrix%pp(4, k, l)*wrepp_d(1)
    2270     4179597 :                            v_d(1, ij, 8) = v_d(1, ij, 8) + ij_matrix%pp_d(1, 5, k, l)*wrepp + ij_matrix%pp(5, k, l)*wrepp_d(1)
    2271     4179597 :                            v_d(1, ij, 9) = v_d(1, ij, 9) + ij_matrix%pp_d(1, 6, k, l)*wrepp + ij_matrix%pp(6, k, l)*wrepp_d(1)
    2272             : 
    2273     4179597 :                            v_d(2, ij, 3) = v_d(2, ij, 3) + ij_matrix%pp_d(2, 1, k, l)*wrepp + ij_matrix%pp(1, k, l)*wrepp_d(2)
    2274     4179597 :                            v_d(2, ij, 6) = v_d(2, ij, 6) + ij_matrix%pp_d(2, 2, k, l)*wrepp + ij_matrix%pp(2, k, l)*wrepp_d(2)
    2275     4179597 :                            v_d(2, ij, 10) = v_d(2, ij, 10) + ij_matrix%pp_d(2, 3, k, l)*wrepp + ij_matrix%pp(3, k, l)*wrepp_d(2)
    2276     4179597 :                            v_d(2, ij, 5) = v_d(2, ij, 5) + ij_matrix%pp_d(2, 4, k, l)*wrepp + ij_matrix%pp(4, k, l)*wrepp_d(2)
    2277     4179597 :                            v_d(2, ij, 8) = v_d(2, ij, 8) + ij_matrix%pp_d(2, 5, k, l)*wrepp + ij_matrix%pp(5, k, l)*wrepp_d(2)
    2278     4179597 :                            v_d(2, ij, 9) = v_d(2, ij, 9) + ij_matrix%pp_d(2, 6, k, l)*wrepp + ij_matrix%pp(6, k, l)*wrepp_d(2)
    2279             : 
    2280     4179597 :                            v_d(3, ij, 3) = v_d(3, ij, 3) + ij_matrix%pp_d(3, 1, k, l)*wrepp + ij_matrix%pp(1, k, l)*wrepp_d(3)
    2281     4179597 :                            v_d(3, ij, 6) = v_d(3, ij, 6) + ij_matrix%pp_d(3, 2, k, l)*wrepp + ij_matrix%pp(2, k, l)*wrepp_d(3)
    2282     4179597 :                            v_d(3, ij, 10) = v_d(3, ij, 10) + ij_matrix%pp_d(3, 3, k, l)*wrepp + ij_matrix%pp(3, k, l)*wrepp_d(3)
    2283     4179597 :                            v_d(3, ij, 5) = v_d(3, ij, 5) + ij_matrix%pp_d(3, 4, k, l)*wrepp + ij_matrix%pp(4, k, l)*wrepp_d(3)
    2284     4179597 :                            v_d(3, ij, 8) = v_d(3, ij, 8) + ij_matrix%pp_d(3, 5, k, l)*wrepp + ij_matrix%pp(5, k, l)*wrepp_d(3)
    2285     4179597 :                            v_d(3, ij, 9) = v_d(3, ij, 9) + ij_matrix%pp_d(3, 6, k, l)*wrepp + ij_matrix%pp(6, k, l)*wrepp_d(3)
    2286             :                         ELSE IF (mm == 4) THEN
    2287      240203 :                            k = k1 - 4
    2288      240203 :                            v_d(1, ij, 11) = v_d(1, ij, 11) + ij_matrix%sd_d(1, k, 1)*wrepp + ij_matrix%sd(k, 1)*wrepp_d(1)
    2289      240203 :                            v_d(1, ij, 16) = v_d(1, ij, 16) + ij_matrix%sd_d(1, k, 2)*wrepp + ij_matrix%sd(k, 2)*wrepp_d(1)
    2290      240203 :                            v_d(1, ij, 22) = v_d(1, ij, 22) + ij_matrix%sd_d(1, k, 3)*wrepp + ij_matrix%sd(k, 3)*wrepp_d(1)
    2291      240203 :                            v_d(1, ij, 29) = v_d(1, ij, 29) + ij_matrix%sd_d(1, k, 4)*wrepp + ij_matrix%sd(k, 4)*wrepp_d(1)
    2292      240203 :                            v_d(1, ij, 37) = v_d(1, ij, 37) + ij_matrix%sd_d(1, k, 5)*wrepp + ij_matrix%sd(k, 5)*wrepp_d(1)
    2293             : 
    2294      240203 :                            v_d(2, ij, 11) = v_d(2, ij, 11) + ij_matrix%sd_d(2, k, 1)*wrepp + ij_matrix%sd(k, 1)*wrepp_d(2)
    2295      240203 :                            v_d(2, ij, 16) = v_d(2, ij, 16) + ij_matrix%sd_d(2, k, 2)*wrepp + ij_matrix%sd(k, 2)*wrepp_d(2)
    2296      240203 :                            v_d(2, ij, 22) = v_d(2, ij, 22) + ij_matrix%sd_d(2, k, 3)*wrepp + ij_matrix%sd(k, 3)*wrepp_d(2)
    2297      240203 :                            v_d(2, ij, 29) = v_d(2, ij, 29) + ij_matrix%sd_d(2, k, 4)*wrepp + ij_matrix%sd(k, 4)*wrepp_d(2)
    2298      240203 :                            v_d(2, ij, 37) = v_d(2, ij, 37) + ij_matrix%sd_d(2, k, 5)*wrepp + ij_matrix%sd(k, 5)*wrepp_d(2)
    2299             : 
    2300      240203 :                            v_d(3, ij, 11) = v_d(3, ij, 11) + ij_matrix%sd_d(3, k, 1)*wrepp + ij_matrix%sd(k, 1)*wrepp_d(3)
    2301      240203 :                            v_d(3, ij, 16) = v_d(3, ij, 16) + ij_matrix%sd_d(3, k, 2)*wrepp + ij_matrix%sd(k, 2)*wrepp_d(3)
    2302      240203 :                            v_d(3, ij, 22) = v_d(3, ij, 22) + ij_matrix%sd_d(3, k, 3)*wrepp + ij_matrix%sd(k, 3)*wrepp_d(3)
    2303      240203 :                            v_d(3, ij, 29) = v_d(3, ij, 29) + ij_matrix%sd_d(3, k, 4)*wrepp + ij_matrix%sd(k, 4)*wrepp_d(3)
    2304      240203 :                            v_d(3, ij, 37) = v_d(3, ij, 37) + ij_matrix%sd_d(3, k, 5)*wrepp + ij_matrix%sd(k, 5)*wrepp_d(3)
    2305             :                         ELSE IF (mm == 5) THEN
    2306      743417 :                            k = k1 - 4
    2307      743417 :                            l = l1 - 1
    2308      743417 :                            v_d(1, ij, 12) = v_d(1, ij, 12) + ij_matrix%pd_d(1, 1, k, l)*wrepp + ij_matrix%pd(1, k, l)*wrepp_d(1)
    2309      743417 :                            v_d(1, ij, 13) = v_d(1, ij, 13) + ij_matrix%pd_d(1, 2, k, l)*wrepp + ij_matrix%pd(2, k, l)*wrepp_d(1)
    2310      743417 :                            v_d(1, ij, 14) = v_d(1, ij, 14) + ij_matrix%pd_d(1, 3, k, l)*wrepp + ij_matrix%pd(3, k, l)*wrepp_d(1)
    2311      743417 :                            v_d(1, ij, 17) = v_d(1, ij, 17) + ij_matrix%pd_d(1, 4, k, l)*wrepp + ij_matrix%pd(4, k, l)*wrepp_d(1)
    2312      743417 :                            v_d(1, ij, 18) = v_d(1, ij, 18) + ij_matrix%pd_d(1, 5, k, l)*wrepp + ij_matrix%pd(5, k, l)*wrepp_d(1)
    2313      743417 :                            v_d(1, ij, 19) = v_d(1, ij, 19) + ij_matrix%pd_d(1, 6, k, l)*wrepp + ij_matrix%pd(6, k, l)*wrepp_d(1)
    2314      743417 :                            v_d(1, ij, 23) = v_d(1, ij, 23) + ij_matrix%pd_d(1, 7, k, l)*wrepp + ij_matrix%pd(7, k, l)*wrepp_d(1)
    2315      743417 :                            v_d(1, ij, 24) = v_d(1, ij, 24) + ij_matrix%pd_d(1, 8, k, l)*wrepp + ij_matrix%pd(8, k, l)*wrepp_d(1)
    2316      743417 :                            v_d(1, ij, 25) = v_d(1, ij, 25) + ij_matrix%pd_d(1, 9, k, l)*wrepp + ij_matrix%pd(9, k, l)*wrepp_d(1)
    2317      743417 :                            v_d(1, ij, 30) = v_d(1, ij, 30) + ij_matrix%pd_d(1, 10, k, l)*wrepp + ij_matrix%pd(10, k, l)*wrepp_d(1)
    2318      743417 :                            v_d(1, ij, 31) = v_d(1, ij, 31) + ij_matrix%pd_d(1, 11, k, l)*wrepp + ij_matrix%pd(11, k, l)*wrepp_d(1)
    2319      743417 :                            v_d(1, ij, 32) = v_d(1, ij, 32) + ij_matrix%pd_d(1, 12, k, l)*wrepp + ij_matrix%pd(12, k, l)*wrepp_d(1)
    2320      743417 :                            v_d(1, ij, 38) = v_d(1, ij, 38) + ij_matrix%pd_d(1, 13, k, l)*wrepp + ij_matrix%pd(13, k, l)*wrepp_d(1)
    2321      743417 :                            v_d(1, ij, 39) = v_d(1, ij, 39) + ij_matrix%pd_d(1, 14, k, l)*wrepp + ij_matrix%pd(14, k, l)*wrepp_d(1)
    2322      743417 :                            v_d(1, ij, 40) = v_d(1, ij, 40) + ij_matrix%pd_d(1, 15, k, l)*wrepp + ij_matrix%pd(15, k, l)*wrepp_d(1)
    2323             : 
    2324      743417 :                            v_d(2, ij, 12) = v_d(2, ij, 12) + ij_matrix%pd_d(2, 1, k, l)*wrepp + ij_matrix%pd(1, k, l)*wrepp_d(2)
    2325      743417 :                            v_d(2, ij, 13) = v_d(2, ij, 13) + ij_matrix%pd_d(2, 2, k, l)*wrepp + ij_matrix%pd(2, k, l)*wrepp_d(2)
    2326      743417 :                            v_d(2, ij, 14) = v_d(2, ij, 14) + ij_matrix%pd_d(2, 3, k, l)*wrepp + ij_matrix%pd(3, k, l)*wrepp_d(2)
    2327      743417 :                            v_d(2, ij, 17) = v_d(2, ij, 17) + ij_matrix%pd_d(2, 4, k, l)*wrepp + ij_matrix%pd(4, k, l)*wrepp_d(2)
    2328      743417 :                            v_d(2, ij, 18) = v_d(2, ij, 18) + ij_matrix%pd_d(2, 5, k, l)*wrepp + ij_matrix%pd(5, k, l)*wrepp_d(2)
    2329      743417 :                            v_d(2, ij, 19) = v_d(2, ij, 19) + ij_matrix%pd_d(2, 6, k, l)*wrepp + ij_matrix%pd(6, k, l)*wrepp_d(2)
    2330      743417 :                            v_d(2, ij, 23) = v_d(2, ij, 23) + ij_matrix%pd_d(2, 7, k, l)*wrepp + ij_matrix%pd(7, k, l)*wrepp_d(2)
    2331      743417 :                            v_d(2, ij, 24) = v_d(2, ij, 24) + ij_matrix%pd_d(2, 8, k, l)*wrepp + ij_matrix%pd(8, k, l)*wrepp_d(2)
    2332      743417 :                            v_d(2, ij, 25) = v_d(2, ij, 25) + ij_matrix%pd_d(2, 9, k, l)*wrepp + ij_matrix%pd(9, k, l)*wrepp_d(2)
    2333      743417 :                            v_d(2, ij, 30) = v_d(2, ij, 30) + ij_matrix%pd_d(2, 10, k, l)*wrepp + ij_matrix%pd(10, k, l)*wrepp_d(2)
    2334      743417 :                            v_d(2, ij, 31) = v_d(2, ij, 31) + ij_matrix%pd_d(2, 11, k, l)*wrepp + ij_matrix%pd(11, k, l)*wrepp_d(2)
    2335      743417 :                            v_d(2, ij, 32) = v_d(2, ij, 32) + ij_matrix%pd_d(2, 12, k, l)*wrepp + ij_matrix%pd(12, k, l)*wrepp_d(2)
    2336      743417 :                            v_d(2, ij, 38) = v_d(2, ij, 38) + ij_matrix%pd_d(2, 13, k, l)*wrepp + ij_matrix%pd(13, k, l)*wrepp_d(2)
    2337      743417 :                            v_d(2, ij, 39) = v_d(2, ij, 39) + ij_matrix%pd_d(2, 14, k, l)*wrepp + ij_matrix%pd(14, k, l)*wrepp_d(2)
    2338      743417 :                            v_d(2, ij, 40) = v_d(2, ij, 40) + ij_matrix%pd_d(2, 15, k, l)*wrepp + ij_matrix%pd(15, k, l)*wrepp_d(2)
    2339             : 
    2340      743417 :                            v_d(3, ij, 12) = v_d(3, ij, 12) + ij_matrix%pd_d(3, 1, k, l)*wrepp + ij_matrix%pd(1, k, l)*wrepp_d(3)
    2341      743417 :                            v_d(3, ij, 13) = v_d(3, ij, 13) + ij_matrix%pd_d(3, 2, k, l)*wrepp + ij_matrix%pd(2, k, l)*wrepp_d(3)
    2342      743417 :                            v_d(3, ij, 14) = v_d(3, ij, 14) + ij_matrix%pd_d(3, 3, k, l)*wrepp + ij_matrix%pd(3, k, l)*wrepp_d(3)
    2343      743417 :                            v_d(3, ij, 17) = v_d(3, ij, 17) + ij_matrix%pd_d(3, 4, k, l)*wrepp + ij_matrix%pd(4, k, l)*wrepp_d(3)
    2344      743417 :                            v_d(3, ij, 18) = v_d(3, ij, 18) + ij_matrix%pd_d(3, 5, k, l)*wrepp + ij_matrix%pd(5, k, l)*wrepp_d(3)
    2345      743417 :                            v_d(3, ij, 19) = v_d(3, ij, 19) + ij_matrix%pd_d(3, 6, k, l)*wrepp + ij_matrix%pd(6, k, l)*wrepp_d(3)
    2346      743417 :                            v_d(3, ij, 23) = v_d(3, ij, 23) + ij_matrix%pd_d(3, 7, k, l)*wrepp + ij_matrix%pd(7, k, l)*wrepp_d(3)
    2347      743417 :                            v_d(3, ij, 24) = v_d(3, ij, 24) + ij_matrix%pd_d(3, 8, k, l)*wrepp + ij_matrix%pd(8, k, l)*wrepp_d(3)
    2348      743417 :                            v_d(3, ij, 25) = v_d(3, ij, 25) + ij_matrix%pd_d(3, 9, k, l)*wrepp + ij_matrix%pd(9, k, l)*wrepp_d(3)
    2349      743417 :                            v_d(3, ij, 30) = v_d(3, ij, 30) + ij_matrix%pd_d(3, 10, k, l)*wrepp + ij_matrix%pd(10, k, l)*wrepp_d(3)
    2350      743417 :                            v_d(3, ij, 31) = v_d(3, ij, 31) + ij_matrix%pd_d(3, 11, k, l)*wrepp + ij_matrix%pd(11, k, l)*wrepp_d(3)
    2351      743417 :                            v_d(3, ij, 32) = v_d(3, ij, 32) + ij_matrix%pd_d(3, 12, k, l)*wrepp + ij_matrix%pd(12, k, l)*wrepp_d(3)
    2352      743417 :                            v_d(3, ij, 38) = v_d(3, ij, 38) + ij_matrix%pd_d(3, 13, k, l)*wrepp + ij_matrix%pd(13, k, l)*wrepp_d(3)
    2353      743417 :                            v_d(3, ij, 39) = v_d(3, ij, 39) + ij_matrix%pd_d(3, 14, k, l)*wrepp + ij_matrix%pd(14, k, l)*wrepp_d(3)
    2354      743417 :                            v_d(3, ij, 40) = v_d(3, ij, 40) + ij_matrix%pd_d(3, 15, k, l)*wrepp + ij_matrix%pd(15, k, l)*wrepp_d(3)
    2355             :                         ELSE IF (mm == 6) THEN
    2356      793204 :                            k = k1 - 4
    2357      793204 :                            l = l1 - 4
    2358      793204 :                            v_d(1, ij, 15) = v_d(1, ij, 15) + ij_matrix%dd_d(1, 1, k, l)*wrepp + ij_matrix%dd(1, k, l)*wrepp_d(1)
    2359      793204 :                            v_d(1, ij, 21) = v_d(1, ij, 21) + ij_matrix%dd_d(1, 2, k, l)*wrepp + ij_matrix%dd(2, k, l)*wrepp_d(1)
    2360      793204 :                            v_d(1, ij, 28) = v_d(1, ij, 28) + ij_matrix%dd_d(1, 3, k, l)*wrepp + ij_matrix%dd(3, k, l)*wrepp_d(1)
    2361      793204 :                            v_d(1, ij, 36) = v_d(1, ij, 36) + ij_matrix%dd_d(1, 4, k, l)*wrepp + ij_matrix%dd(4, k, l)*wrepp_d(1)
    2362      793204 :                            v_d(1, ij, 45) = v_d(1, ij, 45) + ij_matrix%dd_d(1, 5, k, l)*wrepp + ij_matrix%dd(5, k, l)*wrepp_d(1)
    2363      793204 :                            v_d(1, ij, 20) = v_d(1, ij, 20) + ij_matrix%dd_d(1, 6, k, l)*wrepp + ij_matrix%dd(6, k, l)*wrepp_d(1)
    2364      793204 :                            v_d(1, ij, 26) = v_d(1, ij, 26) + ij_matrix%dd_d(1, 7, k, l)*wrepp + ij_matrix%dd(7, k, l)*wrepp_d(1)
    2365      793204 :                            v_d(1, ij, 27) = v_d(1, ij, 27) + ij_matrix%dd_d(1, 8, k, l)*wrepp + ij_matrix%dd(8, k, l)*wrepp_d(1)
    2366      793204 :                            v_d(1, ij, 33) = v_d(1, ij, 33) + ij_matrix%dd_d(1, 9, k, l)*wrepp + ij_matrix%dd(9, k, l)*wrepp_d(1)
    2367      793204 :                            v_d(1, ij, 34) = v_d(1, ij, 34) + ij_matrix%dd_d(1, 10, k, l)*wrepp + ij_matrix%dd(10, k, l)*wrepp_d(1)
    2368      793204 :                            v_d(1, ij, 35) = v_d(1, ij, 35) + ij_matrix%dd_d(1, 11, k, l)*wrepp + ij_matrix%dd(11, k, l)*wrepp_d(1)
    2369      793204 :                            v_d(1, ij, 41) = v_d(1, ij, 41) + ij_matrix%dd_d(1, 12, k, l)*wrepp + ij_matrix%dd(12, k, l)*wrepp_d(1)
    2370      793204 :                            v_d(1, ij, 42) = v_d(1, ij, 42) + ij_matrix%dd_d(1, 13, k, l)*wrepp + ij_matrix%dd(13, k, l)*wrepp_d(1)
    2371      793204 :                            v_d(1, ij, 43) = v_d(1, ij, 43) + ij_matrix%dd_d(1, 14, k, l)*wrepp + ij_matrix%dd(14, k, l)*wrepp_d(1)
    2372      793204 :                            v_d(1, ij, 44) = v_d(1, ij, 44) + ij_matrix%dd_d(1, 15, k, l)*wrepp + ij_matrix%dd(15, k, l)*wrepp_d(1)
    2373             : 
    2374      793204 :                            v_d(2, ij, 15) = v_d(2, ij, 15) + ij_matrix%dd_d(2, 1, k, l)*wrepp + ij_matrix%dd(1, k, l)*wrepp_d(2)
    2375      793204 :                            v_d(2, ij, 21) = v_d(2, ij, 21) + ij_matrix%dd_d(2, 2, k, l)*wrepp + ij_matrix%dd(2, k, l)*wrepp_d(2)
    2376      793204 :                            v_d(2, ij, 28) = v_d(2, ij, 28) + ij_matrix%dd_d(2, 3, k, l)*wrepp + ij_matrix%dd(3, k, l)*wrepp_d(2)
    2377      793204 :                            v_d(2, ij, 36) = v_d(2, ij, 36) + ij_matrix%dd_d(2, 4, k, l)*wrepp + ij_matrix%dd(4, k, l)*wrepp_d(2)
    2378      793204 :                            v_d(2, ij, 45) = v_d(2, ij, 45) + ij_matrix%dd_d(2, 5, k, l)*wrepp + ij_matrix%dd(5, k, l)*wrepp_d(2)
    2379      793204 :                            v_d(2, ij, 20) = v_d(2, ij, 20) + ij_matrix%dd_d(2, 6, k, l)*wrepp + ij_matrix%dd(6, k, l)*wrepp_d(2)
    2380      793204 :                            v_d(2, ij, 26) = v_d(2, ij, 26) + ij_matrix%dd_d(2, 7, k, l)*wrepp + ij_matrix%dd(7, k, l)*wrepp_d(2)
    2381      793204 :                            v_d(2, ij, 27) = v_d(2, ij, 27) + ij_matrix%dd_d(2, 8, k, l)*wrepp + ij_matrix%dd(8, k, l)*wrepp_d(2)
    2382      793204 :                            v_d(2, ij, 33) = v_d(2, ij, 33) + ij_matrix%dd_d(2, 9, k, l)*wrepp + ij_matrix%dd(9, k, l)*wrepp_d(2)
    2383      793204 :                            v_d(2, ij, 34) = v_d(2, ij, 34) + ij_matrix%dd_d(2, 10, k, l)*wrepp + ij_matrix%dd(10, k, l)*wrepp_d(2)
    2384      793204 :                            v_d(2, ij, 35) = v_d(2, ij, 35) + ij_matrix%dd_d(2, 11, k, l)*wrepp + ij_matrix%dd(11, k, l)*wrepp_d(2)
    2385      793204 :                            v_d(2, ij, 41) = v_d(2, ij, 41) + ij_matrix%dd_d(2, 12, k, l)*wrepp + ij_matrix%dd(12, k, l)*wrepp_d(2)
    2386      793204 :                            v_d(2, ij, 42) = v_d(2, ij, 42) + ij_matrix%dd_d(2, 13, k, l)*wrepp + ij_matrix%dd(13, k, l)*wrepp_d(2)
    2387      793204 :                            v_d(2, ij, 43) = v_d(2, ij, 43) + ij_matrix%dd_d(2, 14, k, l)*wrepp + ij_matrix%dd(14, k, l)*wrepp_d(2)
    2388      793204 :                            v_d(2, ij, 44) = v_d(2, ij, 44) + ij_matrix%dd_d(2, 15, k, l)*wrepp + ij_matrix%dd(15, k, l)*wrepp_d(2)
    2389             : 
    2390      793204 :                            v_d(3, ij, 15) = v_d(3, ij, 15) + ij_matrix%dd_d(3, 1, k, l)*wrepp + ij_matrix%dd(1, k, l)*wrepp_d(3)
    2391      793204 :                            v_d(3, ij, 21) = v_d(3, ij, 21) + ij_matrix%dd_d(3, 2, k, l)*wrepp + ij_matrix%dd(2, k, l)*wrepp_d(3)
    2392      793204 :                            v_d(3, ij, 28) = v_d(3, ij, 28) + ij_matrix%dd_d(3, 3, k, l)*wrepp + ij_matrix%dd(3, k, l)*wrepp_d(3)
    2393      793204 :                            v_d(3, ij, 36) = v_d(3, ij, 36) + ij_matrix%dd_d(3, 4, k, l)*wrepp + ij_matrix%dd(4, k, l)*wrepp_d(3)
    2394      793204 :                            v_d(3, ij, 45) = v_d(3, ij, 45) + ij_matrix%dd_d(3, 5, k, l)*wrepp + ij_matrix%dd(5, k, l)*wrepp_d(3)
    2395      793204 :                            v_d(3, ij, 20) = v_d(3, ij, 20) + ij_matrix%dd_d(3, 6, k, l)*wrepp + ij_matrix%dd(6, k, l)*wrepp_d(3)
    2396      793204 :                            v_d(3, ij, 26) = v_d(3, ij, 26) + ij_matrix%dd_d(3, 7, k, l)*wrepp + ij_matrix%dd(7, k, l)*wrepp_d(3)
    2397      793204 :                            v_d(3, ij, 27) = v_d(3, ij, 27) + ij_matrix%dd_d(3, 8, k, l)*wrepp + ij_matrix%dd(8, k, l)*wrepp_d(3)
    2398      793204 :                            v_d(3, ij, 33) = v_d(3, ij, 33) + ij_matrix%dd_d(3, 9, k, l)*wrepp + ij_matrix%dd(9, k, l)*wrepp_d(3)
    2399      793204 :                            v_d(3, ij, 34) = v_d(3, ij, 34) + ij_matrix%dd_d(3, 10, k, l)*wrepp + ij_matrix%dd(10, k, l)*wrepp_d(3)
    2400      793204 :                            v_d(3, ij, 35) = v_d(3, ij, 35) + ij_matrix%dd_d(3, 11, k, l)*wrepp + ij_matrix%dd(11, k, l)*wrepp_d(3)
    2401      793204 :                            v_d(3, ij, 41) = v_d(3, ij, 41) + ij_matrix%dd_d(3, 12, k, l)*wrepp + ij_matrix%dd(12, k, l)*wrepp_d(3)
    2402      793204 :                            v_d(3, ij, 42) = v_d(3, ij, 42) + ij_matrix%dd_d(3, 13, k, l)*wrepp + ij_matrix%dd(13, k, l)*wrepp_d(3)
    2403      793204 :                            v_d(3, ij, 43) = v_d(3, ij, 43) + ij_matrix%dd_d(3, 14, k, l)*wrepp + ij_matrix%dd(14, k, l)*wrepp_d(3)
    2404      793204 :                            v_d(3, ij, 44) = v_d(3, ij, 44) + ij_matrix%dd_d(3, 15, k, l)*wrepp + ij_matrix%dd(15, k, l)*wrepp_d(3)
    2405             :                         END IF
    2406             :                      END IF
    2407             :                   END DO
    2408             :                END DO
    2409    35715084 :                DO kl = 1, limkl
    2410    69066370 :                   logv_d(ij, kl) = (ANY(ABS(v_d(1:3, ij, kl)) > 0.0_dp))
    2411             :                END DO
    2412             :             END DO
    2413             :          END DO
    2414             :          IF (debug_this_module) THEN
    2415             :             CALL rot_2el_2c_first_debug(sepi, sepj, rijv, se_int_control, se_taper, invert, ii, kk, v_d)
    2416             :          END IF
    2417             :       END IF
    2418     1195735 :    END SUBROUTINE rot_2el_2c_first
    2419             : 
    2420             : ! **************************************************************************************************
    2421             : !> \brief Store the two-electron two-center integrals in diagonal form
    2422             : !>
    2423             : !> \param limij ...
    2424             : !> \param limkl ...
    2425             : !> \param ww ...
    2426             : !> \param w ...
    2427             : !> \param ww_dx ...
    2428             : !> \param ww_dy ...
    2429             : !> \param ww_dz ...
    2430             : !> \param dw ...
    2431             : !> \date 04.2008 [tlaino]
    2432             : !> \author Teodoro Laino [tlaino] - University of Zurich
    2433             : ! **************************************************************************************************
    2434     3414082 :    SUBROUTINE store_2el_2c_diag(limij, limkl, ww, w, ww_dx, ww_dy, ww_dz, dw)
    2435             : 
    2436             :       INTEGER, INTENT(IN)                                :: limij, limkl
    2437             :       REAL(KIND=dp), DIMENSION(limkl, limij), &
    2438             :          INTENT(IN), OPTIONAL                            :: ww
    2439             :       REAL(KIND=dp), DIMENSION(:), INTENT(INOUT), &
    2440             :          OPTIONAL                                        :: w
    2441             :       REAL(KIND=dp), DIMENSION(limkl, limij), &
    2442             :          INTENT(IN), OPTIONAL                            :: ww_dx, ww_dy, ww_dz
    2443             :       REAL(KIND=dp), DIMENSION(:, :), INTENT(INOUT), &
    2444             :          OPTIONAL                                        :: dw
    2445             : 
    2446             :       INTEGER                                            :: ij, kl, l
    2447             : 
    2448     1195735 :       l = 0
    2449     1195735 :       IF (PRESENT(ww) .AND. PRESENT(w)) THEN
    2450     5618602 :          DO ij = 1, limij
    2451    41727884 :             DO kl = 1, limkl
    2452    36109282 :                l = l + 1
    2453    41043455 :                w(l) = ww(kl, ij)
    2454             :             END DO
    2455             :          END DO
    2456      511306 :       ELSE IF (PRESENT(ww_dx) .AND. PRESENT(ww_dy) .AND. PRESENT(ww_dz) .AND. PRESENT(dw)) THEN
    2457     4314767 :          DO ij = 1, limij
    2458    34719459 :             DO kl = 1, limkl
    2459    30404692 :                l = l + 1
    2460    30404692 :                dw(1, l) = ww_dx(kl, ij)
    2461    30404692 :                dw(2, l) = ww_dy(kl, ij)
    2462    34208153 :                dw(3, l) = ww_dz(kl, ij)
    2463             :             END DO
    2464             :          END DO
    2465             :       ELSE
    2466           0 :          CPABORT("")
    2467             :       END IF
    2468             : 
    2469     3414082 :    END SUBROUTINE store_2el_2c_diag
    2470             : 
    2471             : END MODULE semi_empirical_int_utils

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