2019-01-25 11:39:31 +01:00
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use bitmasks
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BEGIN_PROVIDER [integer(bit_kind), ref_closed_shell_bitmask, (N_int,2)]
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implicit none
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integer :: i,i0
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integer :: n_occ_ab(2)
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integer :: occ(N_int*bit_kind_size,2)
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call bitstring_to_list_ab(ref_bitmask, occ, n_occ_ab, N_int)
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! do the closed shell determinant
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do i = 1, N_int
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ref_closed_shell_bitmask(i,1) = ref_bitmask(i,1)
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ref_closed_shell_bitmask(i,2) = ref_bitmask(i,2)
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enddo
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do i0 = elec_beta_num+1, elec_alpha_num
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i=occ(i0,1)
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call clear_bit_to_integer(i,ref_closed_shell_bitmask(1,1),N_int)
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enddo
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END_PROVIDER
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BEGIN_PROVIDER [double precision, fock_operator_closed_shell_ref_bitmask, (mo_num, mo_num) ]
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implicit none
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integer :: i0,j0,i,j,k0,k
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integer :: n_occ_ab(2)
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integer :: occ(N_int*bit_kind_size,2)
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integer :: n_occ_ab_virt(2)
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integer :: occ_virt(N_int*bit_kind_size,2)
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integer(bit_kind) :: key_test(N_int)
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integer(bit_kind) :: key_virt(N_int,2)
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call bitstring_to_list_ab(ref_closed_shell_bitmask, occ, n_occ_ab, N_int)
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do i = 1, N_int
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key_virt(i,1) = full_ijkl_bitmask(i)
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key_virt(i,2) = full_ijkl_bitmask(i)
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key_virt(i,1) = xor(key_virt(i,1),ref_closed_shell_bitmask(i,1))
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key_virt(i,2) = xor(key_virt(i,2),ref_closed_shell_bitmask(i,2))
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enddo
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double precision, allocatable :: array_coulomb(:),array_exchange(:)
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allocate (array_coulomb(mo_num),array_exchange(mo_num))
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call bitstring_to_list_ab(key_virt, occ_virt, n_occ_ab_virt, N_int)
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2019-02-04 23:51:09 +01:00
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! docc ---> virt single excitations
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2019-01-25 11:39:31 +01:00
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do i0 = 1, n_occ_ab(1)
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i=occ(i0,1)
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do j0 = 1, n_occ_ab_virt(1)
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j = occ_virt(j0,1)
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call get_mo_two_e_integrals_coulomb_ii(i,j,mo_num,array_coulomb,mo_integrals_map)
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call get_mo_two_e_integrals_exch_ii(i,j,mo_num,array_exchange,mo_integrals_map)
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double precision :: accu
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accu = 0.d0
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do k0 = 1, n_occ_ab(1)
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k = occ(k0,1)
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accu += 2.d0 * array_coulomb(k) - array_exchange(k)
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enddo
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fock_operator_closed_shell_ref_bitmask(i,j) = accu + mo_one_e_integrals(i,j)
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fock_operator_closed_shell_ref_bitmask(j,i) = accu + mo_one_e_integrals(i,j)
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enddo
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enddo
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2019-02-04 23:51:09 +01:00
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! virt ---> virt single excitations
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2019-01-25 11:39:31 +01:00
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do i0 = 1, n_occ_ab_virt(1)
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i=occ_virt(i0,1)
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do j0 = 1, n_occ_ab_virt(1)
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j = occ_virt(j0,1)
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call get_mo_two_e_integrals_coulomb_ii(i,j,mo_num,array_coulomb,mo_integrals_map)
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call get_mo_two_e_integrals_exch_ii(i,j,mo_num,array_exchange,mo_integrals_map)
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accu = 0.d0
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do k0 = 1, n_occ_ab(1)
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k = occ(k0,1)
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accu += 2.d0 * array_coulomb(k) - array_exchange(k)
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enddo
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fock_operator_closed_shell_ref_bitmask(i,j) = accu+ mo_one_e_integrals(i,j)
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fock_operator_closed_shell_ref_bitmask(j,i) = accu+ mo_one_e_integrals(i,j)
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enddo
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enddo
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2019-02-04 23:51:09 +01:00
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! docc ---> docc single excitations
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2019-01-25 11:39:31 +01:00
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do i0 = 1, n_occ_ab(1)
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i=occ(i0,1)
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do j0 = 1, n_occ_ab(1)
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j = occ(j0,1)
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call get_mo_two_e_integrals_coulomb_ii(i,j,mo_num,array_coulomb,mo_integrals_map)
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call get_mo_two_e_integrals_exch_ii(i,j,mo_num,array_exchange,mo_integrals_map)
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accu = 0.d0
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do k0 = 1, n_occ_ab(1)
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k = occ(k0,1)
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accu += 2.d0 * array_coulomb(k) - array_exchange(k)
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enddo
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fock_operator_closed_shell_ref_bitmask(i,j) = accu+ mo_one_e_integrals(i,j)
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fock_operator_closed_shell_ref_bitmask(j,i) = accu+ mo_one_e_integrals(i,j)
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enddo
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enddo
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deallocate(array_coulomb,array_exchange)
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END_PROVIDER
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2019-02-04 23:51:09 +01:00
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subroutine get_single_excitation_from_fock(det_1,det_2,h,p,spin,phase,hij)
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2019-01-25 11:39:31 +01:00
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use bitmasks
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implicit none
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integer,intent(in) :: h,p,spin
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double precision, intent(in) :: phase
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integer(bit_kind), intent(in) :: det_1(N_int,2), det_2(N_int,2)
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double precision, intent(out) :: hij
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integer(bit_kind) :: differences(N_int,2)
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integer(bit_kind) :: hole(N_int,2)
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integer(bit_kind) :: partcl(N_int,2)
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integer :: occ_hole(N_int*bit_kind_size,2)
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integer :: occ_partcl(N_int*bit_kind_size,2)
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integer :: n_occ_ab_hole(2),n_occ_ab_partcl(2)
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integer :: i0,i
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do i = 1, N_int
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differences(i,1) = xor(det_1(i,1),ref_closed_shell_bitmask(i,1))
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differences(i,2) = xor(det_1(i,2),ref_closed_shell_bitmask(i,2))
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hole(i,1) = iand(differences(i,1),ref_closed_shell_bitmask(i,1))
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hole(i,2) = iand(differences(i,2),ref_closed_shell_bitmask(i,2))
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partcl(i,1) = iand(differences(i,1),det_1(i,1))
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partcl(i,2) = iand(differences(i,2),det_1(i,2))
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enddo
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call bitstring_to_list_ab(hole, occ_hole, n_occ_ab_hole, N_int)
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call bitstring_to_list_ab(partcl, occ_partcl, n_occ_ab_partcl, N_int)
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hij = fock_operator_closed_shell_ref_bitmask(h,p)
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! holes :: direct terms
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do i0 = 1, n_occ_ab_hole(1)
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i = occ_hole(i0,1)
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hij -= big_array_coulomb_integrals(i,h,p)
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enddo
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do i0 = 1, n_occ_ab_hole(2)
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i = occ_hole(i0,2)
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hij -= big_array_coulomb_integrals(i,h,p)
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enddo
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! holes :: exchange terms
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do i0 = 1, n_occ_ab_hole(spin)
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i = occ_hole(i0,spin)
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hij += big_array_exchange_integrals(i,h,p)
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enddo
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! particles :: direct terms
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do i0 = 1, n_occ_ab_partcl(1)
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i = occ_partcl(i0,1)
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hij += big_array_coulomb_integrals(i,h,p)
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enddo
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do i0 = 1, n_occ_ab_partcl(2)
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i = occ_partcl(i0,2)
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hij += big_array_coulomb_integrals(i,h,p)
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enddo
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! particles :: exchange terms
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do i0 = 1, n_occ_ab_partcl(spin)
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i = occ_partcl(i0,spin)
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hij -= big_array_exchange_integrals(i,h,p)
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enddo
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hij = hij * phase
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end
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