2019-02-07 22:49:12 +01:00
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subroutine read_integrals(nBas,S,T,V,Hc,G)
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! Read one- and two-electron integrals from files
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implicit none
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! Input variables
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integer,intent(in) :: nBas
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! Local variables
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logical :: debug
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integer :: mu,nu,la,si
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double precision :: Ov,Kin,Nuc,ERI
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! Output variables
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double precision,intent(out) :: S(nBas,nBas),T(nBas,nBas),V(nBas,nBas),Hc(nBas,nBas),G(nBas,nBas,nBas,nBas)
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! Open file with integrals
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debug = .false.
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open(unit=8 ,file='int/Ov.dat')
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open(unit=9 ,file='int/Kin.dat')
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open(unit=10,file='int/Nuc.dat')
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open(unit=11,file='int/ERI.dat')
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! Read overlap integrals
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S = 0d0
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do
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read(8,*,end=8) mu,nu,Ov
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S(mu,nu) = Ov
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enddo
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8 close(unit=8)
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! Read kinetic integrals
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T = 0d0
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do
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read(9,*,end=9) mu,nu,Kin
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2019-03-13 11:34:51 +01:00
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T(mu,nu) = Kin
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2019-02-07 22:49:12 +01:00
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enddo
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9 close(unit=9)
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! Read nuclear integrals
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V = 0d0
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do
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read(10,*,end=10) mu,nu,Nuc
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V(mu,nu) = Nuc
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enddo
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10 close(unit=10)
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! Define core Hamiltonian
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Hc = T + V
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! Read nuclear integrals
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G = 0d0
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do
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2019-03-13 11:34:51 +01:00
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read(11,*,end=11) mu,nu,la,si,ERI
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! (12|34)
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2019-02-07 22:49:12 +01:00
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G(mu,nu,la,si) = ERI
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2019-03-13 11:34:51 +01:00
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! (21|34)
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G(nu,mu,la,si) = ERI
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! (12|43)
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G(mu,nu,si,la) = ERI
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! (21|43)
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2019-02-07 22:49:12 +01:00
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G(nu,mu,si,la) = ERI
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2019-03-13 11:34:51 +01:00
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! (34|12)
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G(la,si,mu,nu) = ERI
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! (43|12)
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G(si,la,mu,nu) = ERI
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! (34|21)
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G(la,si,nu,mu) = ERI
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! (43|21)
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2019-02-07 22:49:12 +01:00
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G(si,la,nu,mu) = ERI
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enddo
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11 close(unit=11)
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! Print results
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if(debug) then
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write(*,'(A28)') '----------------------'
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write(*,'(A28)') 'Overlap integrals'
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write(*,'(A28)') '----------------------'
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call matout(nBas,nBas,S)
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write(*,*)
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write(*,'(A28)') '----------------------'
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write(*,'(A28)') 'Kinetic integrals'
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write(*,'(A28)') '----------------------'
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call matout(nBas,nBas,T)
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write(*,*)
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write(*,'(A28)') '----------------------'
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write(*,'(A28)') 'Nuclear integrals'
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write(*,'(A28)') '----------------------'
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call matout(nBas,nBas,V)
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write(*,*)
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write(*,'(A28)') '----------------------'
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write(*,'(A28)') 'Electron repulsion integrals'
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write(*,'(A28)') '----------------------'
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do la=1,nBas
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do si=1,nBas
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call matout(nBas,nBas,G(1,1,la,si))
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enddo
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enddo
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write(*,*)
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endif
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end subroutine read_integrals
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