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QuAcK/src/RPA/phRRPA.f90

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4.5 KiB
Fortran
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subroutine phRRPA(dotest,TDA,doACFDT,exchange_kernel,singlet,triplet,nBas,nC,nO,nV,nR,nS,ENuc,ERHF,ERI,dipole_int,eHF)
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! Perform a direct random phase approximation calculation
implicit none
include 'parameters.h'
include 'quadrature.h'
! Input variables
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logical,intent(in) :: dotest
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logical,intent(in) :: TDA
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logical,intent(in) :: doACFDT
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logical,intent(in) :: exchange_kernel
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logical,intent(in) :: singlet
logical,intent(in) :: triplet
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integer,intent(in) :: nBas
integer,intent(in) :: nC
integer,intent(in) :: nO
integer,intent(in) :: nV
integer,intent(in) :: nR
integer,intent(in) :: nS
double precision,intent(in) :: ENuc
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double precision,intent(in) :: ERHF
double precision,intent(in) :: eHF(nBas)
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double precision,intent(in) :: ERI(nBas,nBas,nBas,nBas)
double precision,intent(in) :: dipole_int(nBas,nBas,ncart)
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! Local variables
integer :: ispin
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logical :: dRPA
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double precision :: lambda
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double precision,allocatable :: Aph(:,:)
double precision,allocatable :: Bph(:,:)
double precision,allocatable :: Om(:)
double precision,allocatable :: XpY(:,:)
double precision,allocatable :: XmY(:,:)
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double precision :: EcRPA(nspin)
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! Hello world
write(*,*)
write(*,*)'*********************************'
write(*,*)'* Restricted ph-RPA Calculation *'
write(*,*)'*********************************'
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write(*,*)
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! TDA
if(TDA) then
write(*,*) 'Tamm-Dancoff approximation activated!'
write(*,*)
end if
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! Initialization
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dRPA = .true.
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EcRPA(:) = 0d0
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lambda = 1d0
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! Memory allocation
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allocate(Om(nS),XpY(nS,nS),XmY(nS,nS),Aph(nS,nS),Bph(nS,nS))
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! Singlet manifold
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if(singlet) then
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ispin = 1
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call phLR_A(ispin,dRPA,nBas,nC,nO,nV,nR,nS,lambda,eHF,ERI,Aph)
if(.not.TDA) call phLR_B(ispin,dRPA,nBas,nC,nO,nV,nR,nS,lambda,ERI,Bph)
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call phLR(TDA,nS,Aph,Bph,EcRPA(ispin),Om,XpY,XmY)
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call print_excitation_energies('phRPA@RHF','singlet',nS,Om)
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call phLR_transition_vectors(.true.,nBas,nC,nO,nV,nR,nS,dipole_int,Om,XpY,XmY)
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end if
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! Triplet manifold
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if(triplet) then
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ispin = 2
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call phLR_A(ispin,dRPA,nBas,nC,nO,nV,nR,nS,lambda,eHF,ERI,Aph)
if(.not.TDA) call phLR_B(ispin,dRPA,nBas,nC,nO,nV,nR,nS,lambda,ERI,Bph)
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call phLR(TDA,nS,Aph,Bph,EcRPA(ispin),Om,XpY,XmY)
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call print_excitation_energies('phRPA@RHF','triplet',nS,Om)
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call phLR_transition_vectors(.false.,nBas,nC,nO,nV,nR,nS,dipole_int,Om,XpY,XmY)
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end if
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if(exchange_kernel) then
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EcRPA(1) = 0.5d0*EcRPA(1)
EcRPA(2) = 1.5d0*EcRPA(2)
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end if
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write(*,*)
write(*,*)'-------------------------------------------------------------------------------'
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write(*,'(2X,A50,F20.10,A3)') 'Tr@phRPA@RHF correlation energy (singlet) = ',EcRPA(1),' au'
write(*,'(2X,A50,F20.10,A3)') 'Tr@phRPA@RHF correlation energy (triplet) = ',EcRPA(2),' au'
write(*,'(2X,A50,F20.10,A3)') 'Tr@phRPA@RHF correlation energy = ',sum(EcRPA),' au'
write(*,'(2X,A50,F20.10,A3)') 'Tr@phRPA@RHF total energy = ',ENuc + ERHF + sum(EcRPA),' au'
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write(*,*)'-------------------------------------------------------------------------------'
write(*,*)
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deallocate(Om,XpY,XmY,Aph,Bph)
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! Compute the correlation energy via the adiabatic connection
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if(doACFDT) then
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write(*,*) '--------------------------------------------------------'
write(*,*) 'Adiabatic connection version of phRPA correlation energy'
write(*,*) '--------------------------------------------------------'
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write(*,*)
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call phACFDT(exchange_kernel,dRPA,TDA,singlet,triplet,nBas,nC,nO,nV,nR,nS,ERI,eHF,EcRPA)
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write(*,*)
write(*,*)'-------------------------------------------------------------------------------'
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write(*,'(2X,A50,F20.10,A3)') 'AC@phRPA@RHF correlation energy (singlet) = ',EcRPA(1),' au'
write(*,'(2X,A50,F20.10,A3)') 'AC@phRPA@RHF correlation energy (triplet) = ',EcRPA(2),' au'
write(*,'(2X,A50,F20.10,A3)') 'AC@phRPA@RHF correlation energy = ',sum(EcRPA),' au'
write(*,'(2X,A50,F20.10,A3)') 'AC@phRPA@RHF total energy = ',ENuc + ERHF + sum(EcRPA),' au'
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write(*,*)'-------------------------------------------------------------------------------'
write(*,*)
end if
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if(dotest) then
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call dump_test_value('R','phRPA correlation energy',sum(EcRPA))
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end if
end subroutine