mirror of
https://github.com/LCPQ/quantum_package
synced 2024-11-03 12:43:52 +01:00
218 lines
5.9 KiB
Fortran
218 lines
5.9 KiB
Fortran
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program casscf
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implicit none
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BEGIN_DOC
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! Optimize MOs and CI coefficients of the CAS
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END_DOC
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double precision, allocatable :: pt2(:), norm_pert(:), H_pert_diag(:)
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integer(bit_kind), allocatable :: generators_bitmask_save(:,:,:,:)
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integer :: degree, N_generators_bitmask_save, N_det_ci
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double precision :: E_old, E_CI
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double precision :: selection_criterion_save, selection_criterion_min_save
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integer :: N_det_old
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integer :: i, j, k, l
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integer :: i_bit, j_bit, i_int, j_int
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integer(bit_kind), allocatable :: bit_tmp(:), cas_bm(:)
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character*(64) :: label
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allocate( pt2(N_states), norm_pert(N_states),H_pert_diag(N_states) )
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allocate( generators_bitmask_save(N_int,2,6,N_generators_bitmask) )
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allocate( bit_tmp(N_int), cas_bm(N_int) )
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PROVIDE N_det_cas
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N_det_old = 0
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pt2 = 1.d0
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E_CI = 1.d0
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E_old = 0.d0
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diag_algorithm = "Lapack"
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selection_criterion_save = selection_criterion
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selection_criterion_min_save = selection_criterion_min
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cas_bm = 0_bit_kind
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do i=1,N_cas_bitmask
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do j=1,N_int
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cas_bm(j) = ior(cas_bm(j), cas_bitmask(j,1,i))
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cas_bm(j) = ior(cas_bm(j), cas_bitmask(j,2,i))
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enddo
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enddo
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! Save CAS-SD bitmask
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generators_bitmask_save = generators_bitmask
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N_generators_bitmask_save = N_generators_bitmask
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! Set the CAS bitmask
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do i=1,6
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generators_bitmask(:,:,i,:) = cas_bitmask
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enddo
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N_generators_bitmask = N_cas_bitmask
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SOFT_TOUCH generators_bitmask N_generators_bitmask
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! If the number of dets already in the file is larger than the requested
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! number of determinants, truncate the wf
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if (N_det > N_det_max) then
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call diagonalize_CI
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call save_wavefunction
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psi_det = psi_det_sorted
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psi_coef = psi_coef_sorted
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N_det = N_det_max
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soft_touch N_det psi_det psi_coef
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call diagonalize_CI
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call save_wavefunction
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print *, 'N_det = ', N_det
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print *, 'N_states = ', N_states
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print *, 'PT2 = ', pt2
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print *, 'E = ', CI_energy
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print *, 'E+PT2 = ', CI_energy+pt2
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print *, '-----'
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endif
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! Start MCSCF iteration
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! CAS-CI
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! ------
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E_old = E_CI
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! Reset the selection criterion
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selection_criterion = selection_criterion_save
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selection_criterion_min = selection_criterion_min_save
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SOFT_TOUCH selection_criterion_min selection_criterion selection_criterion_factor
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! Set the CAS bitmask
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do i=1,6
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generators_bitmask(:,:,i,:) = cas_bitmask
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enddo
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N_generators_bitmask = N_cas_bitmask
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SOFT_TOUCH generators_bitmask N_generators_bitmask
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do while (N_det < N_det_max.and.maxval(abs(pt2(1:N_states))) > pt2_max)
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N_det_old = N_det
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call H_apply_CAS_SD_selected_no_skip(pt2, norm_pert, H_pert_diag, N_states)
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PROVIDE psi_coef
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PROVIDE psi_det
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PROVIDE psi_det_sorted
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if (N_det > N_det_max) then
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psi_det = psi_det_sorted
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psi_coef = psi_coef_sorted
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N_det = N_det_max
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soft_touch N_det psi_det psi_coef
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endif
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call diagonalize_CI
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call save_wavefunction
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print *, '======'
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print *, 'CAS-CI'
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print *, '======'
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print *, ''
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print *, 'N_det = ', N_det
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print *, 'N_states = ', N_states
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print *, 'PT2 = ', pt2
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print *, 'E(CAS) = ', CI_energy
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print *, 'E(CAS)+PT2 = ', CI_energy+pt2
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print *, '-----'
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print *, ''
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E_CI = sum(CI_energy(1:N_states)+pt2(1:N_states))/dble(N_states)
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call ezfio_set_casscf_energy(CI_energy(1))
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if (N_det == N_det_old) then
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exit
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endif
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enddo
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! Super-CI
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! --------
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selection_criterion_min = 1.d-12
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selection_criterion = 1.d-12
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! Set the CAS bitmask
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generators_bitmask = generators_bitmask_save
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N_generators_bitmask = N_generators_bitmask_save
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SOFT_TOUCH generators_bitmask N_generators_bitmask selection_criterion selection_criterion_min selection_criterion_factor
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N_det_ci = N_det
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call H_apply_CAS_SD_selected(pt2, norm_pert, H_pert_diag, N_states)
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do i=1,mo_tot_num
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i_int = ishft(i-1,-bit_kind_shift)+1
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i_bit = j-ishft(i_int-1,bit_kind_shift)-1
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bit_tmp(:) = 0_bit_kind
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bit_tmp(i_int) = ibset(0_bit_kind,i_bit)
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if (iand(bit_tmp(i_int), cas_bm(i_int)) == 0_bit_kind) then
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! Not a CAS MO
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cycle
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endif
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do j=1,mo_tot_num
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if (j == i) then
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cycle
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endif
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j_int = ishft(j-1,-bit_kind_shift)+1
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j_bit = j-ishft(j_int-1,bit_kind_shift)-1
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bit_tmp(:) = 0_bit_kind
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bit_tmp(j_int) = ibset(0_bit_kind,j_bit)
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if (iand(bit_tmp(j_int), cas_bm(j_int)) == 0_bit_kind) then
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! Not a CAS MO
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cycle
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endif
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! Now, both i and j are MOs of the CAS. De-couple them in the DM
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one_body_dm_mo(i,j) = 0.d0
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enddo
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enddo
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SOFT_TOUCH one_body_dm_mo
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double precision :: mx, ov
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double precision, allocatable :: mo_coef_old(:,:)
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integer, allocatable :: iorder(:)
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logical, allocatable :: selected(:)
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allocate( mo_coef_old(size(mo_coef,1), size(mo_coef,2)), iorder(mo_tot_num), selected(mo_tot_num) )
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mo_coef_old = mo_coef
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label = "Canonical"
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call mo_as_eigvectors_of_mo_matrix(one_body_dm_mo,size(one_body_dm_mo,1),size(one_body_dm_mo,2),label,-1)
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selected = .False.
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do j=1,mo_tot_num
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mx = -1.d0
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iorder(j) = j
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do i=1,mo_tot_num
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if (selected(i)) then
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cycle
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endif
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ov = 0.d0
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do l=1,ao_num
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do k=1,ao_num
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ov = ov + mo_coef_old(k,j) * ao_overlap(k,l) * mo_coef(l,i)
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enddo
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enddo
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ov= dabs(ov)
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if (ov > mx) then
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mx = ov
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iorder(j) = i
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endif
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enddo
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selected( iorder(j) ) = .True.
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enddo
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mo_coef_old = mo_coef
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do i=1,mo_tot_num
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mo_coef(:,i) = mo_coef_old(:,iorder(i))
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enddo
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call save_mos
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call write_double(6,E_CI,"Energy(CAS)")
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deallocate( mo_coef_old )
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deallocate( pt2, norm_pert,H_pert_diag )
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deallocate( generators_bitmask_save )
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deallocate( bit_tmp, cas_bm, iorder )
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end
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