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37 lines
723 B
Fortran
37 lines
723 B
Fortran
subroutine restricted_fock_exchange_potential(nBas,P,ERI,Fx)
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! Compute the Fock exchange potential
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implicit none
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! Input variables
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integer,intent(in) :: nBas
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double precision,intent(in) :: P(nBas,nBas)
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double precision,intent(in) :: ERI(nBas,nBas,nBas,nBas)
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! Local variables
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integer :: mu,nu,la,si
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! Output variables
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double precision,intent(out) :: Fx(nBas,nBas)
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! Compute HF exchange matrix
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Fx(:,:) = 0d0
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do si=1,nBas
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do la=1,nBas
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do nu=1,nBas
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do mu=1,nBas
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Fx(mu,nu) = Fx(mu,nu) - P(la,si)*ERI(mu,la,si,nu)
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enddo
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enddo
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enddo
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enddo
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Fx(:,:) = 0.5d0*Fx(:,:)
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end subroutine restricted_fock_exchange_potential
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