mirror of
https://github.com/pfloos/quack
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175 lines
6.6 KiB
Fortran
175 lines
6.6 KiB
Fortran
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subroutine UHF_stability(nBas,nC,nO,nV,nR,nS,eHF,ERI_aaaa,ERI_aabb,ERI_bbbb)
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! Perform a stability analysis of the UHF solution
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implicit none
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include 'parameters.h'
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! Input variables
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integer,intent(in) :: nBas
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integer,intent(in) :: nC(nspin)
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integer,intent(in) :: nO(nspin)
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integer,intent(in) :: nV(nspin)
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integer,intent(in) :: nR(nspin)
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integer,intent(in) :: nS(nspin)
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double precision,intent(in) :: eHF(nBas,nspin)
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double precision,intent(in) :: ERI_aaaa(nBas,nBas,nBas,nBas)
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double precision,intent(in) :: ERI_aabb(nBas,nBas,nBas,nBas)
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double precision,intent(in) :: ERI_bbbb(nBas,nBas,nBas,nBas)
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! Local variables
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integer,parameter :: maxS = 20
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integer :: ia
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integer :: ispin
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integer :: nS_aa,nS_bb,nS_sc
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double precision,allocatable :: Om_sc(:)
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double precision,allocatable :: A_sc(:,:)
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double precision,allocatable :: B_sc(:,:)
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double precision,allocatable :: AB_sc(:,:)
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integer :: nS_ab,nS_ba,nS_sf
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double precision,allocatable :: Om_sf(:)
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double precision,allocatable :: A_sf(:,:)
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double precision,allocatable :: B_sf(:,:)
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double precision,allocatable :: AB_sf(:,:)
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! Menory allocation
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nS_aa = nS(1)
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nS_bb = nS(2)
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nS_sc = nS_aa + nS_bb
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allocate(Om_sc(nS_sc),A_sc(nS_sc,nS_sc),B_sc(nS_sc,nS_sc),AB_sc(nS_sc,nS_sc))
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!-------------------------------------------------------------!
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! Stability analysis: Real UHF -> Real UHF
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!-------------------------------------------------------------!
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ispin = 1
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call unrestricted_linear_response_A_matrix(ispin,.false.,nBas,nC,nO,nV,nR,nS_aa,nS_bb,nS_sc,1d0,eHF, &
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ERI_aaaa,ERI_aabb,ERI_bbbb,A_sc)
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call unrestricted_linear_response_B_matrix(ispin,.false.,nBas,nC,nO,nV,nR,nS_aa,nS_bb,nS_sc,1d0, &
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ERI_aaaa,ERI_aabb,ERI_bbbb,B_sc)
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AB_sc(:,:) = A_sc(:,:) + B_sc(:,:)
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call diagonalize_matrix(nS_sc,AB_sc,Om_sc)
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write(*,*)'-------------------------------------------------------------'
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write(*,*)'| Stability analysis: Real UHF -> Real UHF |'
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write(*,*)'-------------------------------------------------------------'
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write(*,'(1X,A1,1X,A5,1X,A1,1X,A23,1X,A1,1X,A23,1X,A1,1X)') &
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'|','State','|',' Excitation energy (au) ','|',' Excitation energy (eV) ','|'
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write(*,*)'-------------------------------------------------------------'
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do ia=1,min(nS_sc,maxS)
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write(*,'(1X,A1,1X,I5,1X,A1,1X,F23.6,1X,A1,1X,F23.6,1X,A1,1X)') &
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'|',ia,'|',Om_sc(ia),'|',Om_sc(ia)*HaToeV,'|'
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enddo
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write(*,*)'-------------------------------------------------------------'
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if(minval(Om_sc(:)) < 0d0) then
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write(*,'(1X,A40,1X)') 'Too bad, UHF solution is unstable!'
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write(*,'(1X,A40,1X,F15.10,A3)') 'Largest negative eigenvalue: ',Om_sc(1),' au'
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else
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write(*,'(1X,A40,1X)') 'Well done, UHF solution is stable!'
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write(*,'(1X,A40,1X,F15.10,A3)') 'Smallest eigenvalue: ',Om_sc(1),' au'
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end if
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write(*,*)'-------------------------------------------------------------'
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write(*,*)
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!-------------------------------------------------------------!
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! Stability analysis: Real UHF -> Complex UHF
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!-------------------------------------------------------------!
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AB_sc(:,:) = A_sc(:,:) - B_sc(:,:)
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call diagonalize_matrix(nS_sc,AB_sc,Om_sc)
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write(*,*)'-------------------------------------------------------------'
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write(*,*)'| Stability analysis: Real UHF -> Complex UHF |'
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write(*,*)'-------------------------------------------------------------'
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write(*,'(1X,A1,1X,A5,1X,A1,1X,A23,1X,A1,1X,A23,1X,A1,1X)') &
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'|','State','|',' Excitation energy (au) ','|',' Excitation energy (eV) ','|'
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write(*,*)'-------------------------------------------------------------'
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do ia=1,min(nS_sc,maxS)
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write(*,'(1X,A1,1X,I5,1X,A1,1X,F23.6,1X,A1,1X,F23.6,1X,A1,1X)') &
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'|',ia,'|',Om_sc(ia),'|',Om_sc(ia)*HaToeV,'|'
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enddo
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write(*,*)'-------------------------------------------------------------'
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if(minval(Om_sc(:)) < 0d0) then
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write(*,'(1X,A40,1X)') 'Too bad, UHF solution is unstable!'
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write(*,'(1X,A40,1X,F15.10,A3)') 'Largest negative eigenvalue: ',Om_sc(1),' au'
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else
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write(*,'(1X,A40,1X)') 'Well done, UHF solution is stable!'
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write(*,'(1X,A40,1X,F15.10,A3)') 'Smallest eigenvalue: ',Om_sc(1),' au'
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end if
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write(*,*)'-------------------------------------------------------------'
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write(*,*)
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! Menory (de)allocation
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nS_ab = (nO(1) - nC(1))*(nV(2) - nR(2))
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nS_ba = (nO(2) - nC(2))*(nV(1) - nR(1))
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nS_sf = nS_ab + nS_ba
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deallocate(Om_sc,A_sc,B_sc,AB_sc)
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allocate(Om_sf(nS_sf),A_sf(nS_sf,nS_sf),B_sf(nS_sf,nS_sf),AB_sf(nS_sf,nS_sf))
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!-------------------------------------------------------------!
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! Stability analysis: Real UHF -> Real GHF
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!-------------------------------------------------------------!
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ispin = 2
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call unrestricted_linear_response_A_matrix(ispin,.false.,nBas,nC,nO,nV,nR,nS_ab,nS_ba,nS_sf,1d0,eHF, &
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ERI_aaaa,ERI_aabb,ERI_bbbb,A_sf)
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call unrestricted_linear_response_B_matrix(ispin,.false.,nBas,nC,nO,nV,nR,nS_ab,nS_ba,nS_sf,1d0, &
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ERI_aaaa,ERI_aabb,ERI_bbbb,B_sf)
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AB_sf(:,:) = A_sf(:,:) + B_sf(:,:)
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call diagonalize_matrix(nS_sf,AB_sf,Om_sf)
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write(*,*)'-------------------------------------------------------------'
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write(*,*)'| Stability analysis: Real UHF -> Real GHF |'
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write(*,*)'-------------------------------------------------------------'
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write(*,'(1X,A1,1X,A5,1X,A1,1X,A23,1X,A1,1X,A23,1X,A1,1X)') &
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'|','State','|',' Excitation energy (au) ','|',' Excitation energy (eV) ','|'
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write(*,*)'-------------------------------------------------------------'
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do ia=1,min(nS_sf,maxS)
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write(*,'(1X,A1,1X,I5,1X,A1,1X,F23.6,1X,A1,1X,F23.6,1X,A1,1X)') &
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'|',ia,'|',Om_sf(ia),'|',Om_sf(ia)*HaToeV,'|'
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enddo
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write(*,*)'-------------------------------------------------------------'
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if(minval(Om_sf(:)) < 0d0) then
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write(*,'(1X,A40,1X)') 'Too bad, UHF solution is unstable!'
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write(*,'(1X,A40,1X,F15.10,A3)') 'Largest negative eigenvalue: ',Om_sf(1),' au'
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else
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write(*,'(1X,A40,1X)') 'Well done, UHF solution is stable!'
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write(*,'(1X,A40,1X,F15.10,A3)') 'Smallest eigenvalue: ',Om_sf(1),' au'
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end if
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write(*,*)'-------------------------------------------------------------'
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write(*,*)
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end subroutine UHF_stability
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