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78 lines
2.0 KiB
FortranFixed
78 lines
2.0 KiB
FortranFixed
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program cisd
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implicit none
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BEGIN_DOC
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! Multi-Reference Configuration Interaction with Single and Double excitations.
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!
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! This program takes a reference wave function as input and
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! and performs all single and double excitations on top of it, disregarding
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! spatial symmetry and compute the "n_states" lowest eigenstates of that CI
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! matrix (see :option:`determinants n_states`).
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!
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END_DOC
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PROVIDE N_states
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read_wf = .True.
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SOFT_TOUCH read_wf
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call run
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end
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subroutine run
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implicit none
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integer :: i,k
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double precision :: cisdq(N_states), delta_e
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double precision,external :: diag_h_mat_elem
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if(do_singles)then
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if(do_doubles)then
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call H_apply_cisd
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else
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call H_apply_cis
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endif
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else
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if(do_doubles)then
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call H_apply_cid
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else
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stop "do_singles and do_doubles are both False"
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endif
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endif
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psi_coef = ci_eigenvectors
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SOFT_TOUCH psi_coef
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call save_wavefunction
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call ezfio_set_general_mrci_energy(CI_energy)
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do i = 1,N_states
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k = maxloc(dabs(psi_coef_sorted(1:N_det,i)),dim=1)
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delta_E = CI_electronic_energy(i) - diag_h_mat_elem(psi_det_sorted(1,1,k),N_int)
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cisdq(i) = CI_energy(i) + delta_E * (1.d0 - psi_coef_sorted(k,i)**2)
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enddo
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print *, 'N_det = ', N_det
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print*,''
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print*,'******************************'
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print *, 'MR-CI Energies'
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do i = 1,N_states
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print *, i, CI_energy(i)
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enddo
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print*,''
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print*,'******************************'
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print *, 'MR-CI+Q Energies'
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do i = 1,N_states
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print *, i, cisdq(i)
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enddo
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if (N_states > 1) then
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print*,''
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print*,'******************************'
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print*,'Excitation energies (au) (CISD+Q)'
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do i = 2, N_states
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print*, i ,CI_energy(i) - CI_energy(1), cisdq(i) - cisdq(1)
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enddo
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print*,''
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print*,'******************************'
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print*,'Excitation energies (eV) (CISD+Q)'
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do i = 2, N_states
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print*, i ,(CI_energy(i) - CI_energy(1))/0.0367502d0, &
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(cisdq(i) - cisdq(1)) / 0.0367502d0
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enddo
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endif
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end
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