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https://github.com/LCPQ/quantum_package
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133 lines
4.5 KiB
Fortran
133 lines
4.5 KiB
Fortran
subroutine damping_SCF
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implicit none
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double precision :: E
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double precision, allocatable :: D_alpha(:,:), D_beta(:,:)
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double precision :: E_new
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double precision, allocatable :: D_new_alpha(:,:), D_new_beta(:,:), F_new(:,:)
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double precision, allocatable :: delta_alpha(:,:), delta_beta(:,:)
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double precision :: lambda, E_half, a, b, delta_D, delta_E, E_min
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integer :: i,j,k
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logical :: saving
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character :: save_char
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allocate( &
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D_alpha( ao_num_align, ao_num ), &
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D_beta( ao_num_align, ao_num ), &
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F_new( ao_num_align, ao_num ), &
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D_new_alpha( ao_num_align, ao_num ), &
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D_new_beta( ao_num_align, ao_num ), &
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delta_alpha( ao_num_align, ao_num ), &
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delta_beta( ao_num_align, ao_num ))
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do j=1,ao_num
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do i=1,ao_num
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D_alpha(i,j) = HF_density_matrix_ao_alpha(i,j)
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D_beta (i,j) = HF_density_matrix_ao_beta (i,j)
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enddo
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enddo
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call write_time(output_hartree_fock)
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write(output_hartree_fock,'(A4,1X,A16, 1X, A16, 1X, A16, 1X, A4 )') &
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'====','================','================','================', '===='
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write(output_hartree_fock,'(A4,1X,A16, 1X, A16, 1X, A16, 1X, A4 )') &
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' N ', 'Energy ', 'Energy diff ', 'Density diff ', 'Save'
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write(output_hartree_fock,'(A4,1X,A16, 1X, A16, 1X, A16, 1X, A4 )') &
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'====','================','================','================', '===='
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E = HF_energy + 1.d0
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E_min = HF_energy
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delta_D = 0.d0
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do k=1,n_it_scf_max
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delta_E = HF_energy - E
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E = HF_energy
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if ( (delta_E < 0.d0).and.(dabs(delta_E) < thresh_scf) ) then
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exit
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endif
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saving = E < E_min
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if (saving) then
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call save_mos
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save_char = 'X'
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E_min = E
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else
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save_char = ' '
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endif
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write(output_hartree_fock,'(I4,1X,F16.10, 1X, F16.10, 1X, F16.10, 3X, A )') &
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k, E, delta_E, delta_D, save_char
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D_alpha = HF_density_matrix_ao_alpha
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D_beta = HF_density_matrix_ao_beta
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mo_coef = eigenvectors_fock_matrix_mo
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TOUCH mo_coef
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D_new_alpha = HF_density_matrix_ao_alpha
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D_new_beta = HF_density_matrix_ao_beta
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F_new = Fock_matrix_ao
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E_new = HF_energy
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delta_alpha = D_new_alpha - D_alpha
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delta_beta = D_new_beta - D_beta
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lambda = .5d0
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E_half = 0.d0
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do while (E_half > E)
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HF_density_matrix_ao_alpha = D_alpha + lambda * delta_alpha
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HF_density_matrix_ao_beta = D_beta + lambda * delta_beta
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TOUCH HF_density_matrix_ao_alpha HF_density_matrix_ao_beta
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mo_coef = eigenvectors_fock_matrix_mo
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TOUCH mo_coef
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E_half = HF_energy
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if ((E_half > E).and.(E_new < E)) then
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lambda = 1.d0
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exit
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else if ((E_half > E).and.(lambda > 5.d-4)) then
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lambda = 0.5d0 * lambda
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E_new = E_half
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else
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exit
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endif
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enddo
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a = (E_new + E - 2.d0*E_half)*2.d0
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b = -E_new - 3.d0*E + 4.d0*E_half
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lambda = -lambda*b/(a+1.d-16)
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D_alpha = (1.d0-lambda) * D_alpha + lambda * D_new_alpha
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D_beta = (1.d0-lambda) * D_beta + lambda * D_new_beta
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delta_E = HF_energy - E
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do j=1,ao_num
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do i=1,ao_num
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delta_D = delta_D + &
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(D_alpha(i,j) - HF_density_matrix_ao_alpha(i,j))*(D_alpha(i,j) - HF_density_matrix_ao_alpha(i,j)) + &
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(D_beta (i,j) - HF_density_matrix_ao_beta (i,j))*(D_beta (i,j) - HF_density_matrix_ao_beta (i,j))
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enddo
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enddo
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delta_D = dsqrt(delta_D/dble(ao_num)**2)
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HF_density_matrix_ao_alpha = D_alpha
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HF_density_matrix_ao_beta = D_beta
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TOUCH HF_density_matrix_ao_alpha HF_density_matrix_ao_beta
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mo_coef = eigenvectors_fock_matrix_mo
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TOUCH mo_coef
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enddo
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write(output_hartree_fock,'(A4,1X,A16, 1X, A16, 1X, A16, 1X, A4 )') '====','================','================','================', '===='
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write(output_hartree_fock,*)
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if(.not.no_oa_or_av_opt)then
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call mo_as_eigvectors_of_mo_matrix(Fock_matrix_mo,size(Fock_matrix_mo,1),size(Fock_matrix_mo,2),mo_label,1)
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endif
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call write_double(output_hartree_fock, E_min, 'Hartree-Fock energy')
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call ezfio_set_hartree_fock_energy(E_min)
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call write_time(output_hartree_fock)
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deallocate(D_alpha,D_beta,F_new,D_new_alpha,D_new_beta,delta_alpha,delta_beta)
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end
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