mirror of
https://github.com/LCPQ/quantum_package
synced 2024-12-24 21:33:52 +01:00
93 lines
2.6 KiB
Fortran
93 lines
2.6 KiB
Fortran
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program full_ci
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implicit none
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integer :: i,k
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integer :: N_det_old
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double precision, allocatable :: pt2(:), norm_pert(:), H_pert_diag(:)
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integer :: N_st, degree
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N_st = N_states
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allocate (pt2(N_st), norm_pert(N_st),H_pert_diag(N_st))
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character*(64) :: perturbation
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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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diag_algorithm = "Lapack"
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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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do while (N_det < N_det_max.and.maxval(abs(pt2(1:N_st))) > pt2_max)
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N_det_old = N_det
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call H_apply_CAS_S(pt2, norm_pert, H_pert_diag, N_st)
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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 *, '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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call ezfio_set_cas_sd_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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call diagonalize_CI
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if(do_pt2_end)then
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print*,'Last iteration only to compute the PT2'
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threshold_selectors = 1.d0
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threshold_generators = 0.999d0
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call H_apply_CAS_S_PT2(pt2, norm_pert, H_pert_diag, N_st)
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print *, 'Final step'
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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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call ezfio_set_cas_sd_energy_pt2(CI_energy(1)+pt2(1))
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endif
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integer :: exc_max, degree_min
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exc_max = 0
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print *, 'CAS determinants : ', N_det_cas
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do i=1,min(N_det_cas,10)
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do k=i,N_det_cas
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call get_excitation_degree(psi_cas(1,1,k),psi_cas(1,1,i),degree,N_int)
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exc_max = max(exc_max,degree)
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enddo
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call debug_det(psi_cas(1,1,i),N_int)
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print *, ''
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enddo
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print *, 'Max excitation degree in the CAS :', exc_max
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end
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