2019-09-11 14:47:18 +02:00
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subroutine form_cW_nc(nO,nV,t1,t2,tau,OOOO,OOOV,OOVO,OOVV,OVVO,OVVV,VOVV,VVVV,cWoooo,cWovvo,cWvvvv)
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! Compute W terms in CCSD
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implicit none
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! Input variables
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integer,intent(in) :: nO,nV
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double precision,intent(in) :: t1(nO,nV)
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double precision,intent(in) :: t2(nO,nO,nV,nV)
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double precision,intent(in) :: tau(nO,nO,nV,nV)
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double precision,intent(in) :: OOOO(nO,nO,nO,nO)
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double precision,intent(in) :: OOOV(nO,nO,nO,nV)
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double precision,intent(in) :: OOVO(nO,nO,nV,nO)
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double precision,intent(in) :: OOVV(nO,nO,nV,nV)
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double precision,intent(in) :: OVVO(nO,nV,nV,nO)
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double precision,intent(in) :: OVVV(nO,nV,nV,nV)
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double precision,intent(in) :: VOVV(nV,nO,nV,nV)
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double precision,intent(in) :: VVVV(nV,nV,nV,nV)
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! Local variables
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integer :: i,j,m,n
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integer :: a,b,e,f
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double precision,external :: Kronecker_Delta
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! Output variables
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double precision,intent(out) :: cWoooo(nO,nO,nO,nO)
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double precision,intent(out) :: cWovvo(nO,nV,nV,nO)
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double precision,intent(out) :: cWvvvv(nV,nV,nV,nV)
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! OOOO block
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cWoooo(:,:,:,:) = OOOO(:,:,:,:)
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do m=1,nO
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do n=1,nO
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do i=1,nO
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do j=1,nO
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do e=1,nV
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cWoooo(m,n,i,j) = cWoooo(m,n,i,j) + t1(j,e)*OOOV(m,n,i,e) - t1(i,e)*OOOV(m,n,j,e)
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end do
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do e=1,nV
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do f=1,nV
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cWoooo(m,n,i,j) = cWoooo(m,n,i,j) + 0.25d0*tau(i,j,e,f)*OOVV(m,n,e,f)
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end do
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end do
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end do
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end do
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end do
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end do
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! OVVO block
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cWovvo(:,:,:,:) = OVVO(:,:,:,:)
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do m=1,nO
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do b=1,nV
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do e=1,nV
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do j=1,nO
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do f=1,nV
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cWovvo(m,b,e,j) = cWovvo(m,b,e,j) + t1(j,f)*OVVV(m,b,e,f)
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end do
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do n=1,nO
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cWovvo(m,b,e,j) = cWovvo(m,b,e,j) - t1(n,b)*OOVO(m,n,e,j)
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end do
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do n=1,nO
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do f=1,nV
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cWovvo(m,b,e,j) = cWovvo(m,b,e,j) &
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2019-09-11 20:56:36 +02:00
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- ( 0.5d0*t2(j,n,f,b) + t1(j,f)*t1(n,b) )*OOVV(m,n,e,f)
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2019-09-11 14:47:18 +02:00
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end do
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end do
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end do
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end do
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end do
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end do
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! VVVV block
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cWvvvv(:,:,:,:) = VVVV(:,:,:,:)
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do a=1,nV
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do b=1,nV
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do e=1,nV
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do f=1,nV
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do m=1,nO
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cWvvvv(a,b,e,f) = cWvvvv(a,b,e,f) - t1(m,b)*VOVV(a,m,e,f) + t1(m,a)*VOVV(b,m,e,f)
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end do
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do m=1,nO
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do n=1,nO
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cWvvvv(a,b,e,f) = cWvvvv(a,b,e,f) + 0.25d0*tau(m,n,a,b)*OOVV(m,n,e,f)
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end do
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end do
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end do
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end do
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end do
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end do
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end subroutine form_cW_nc
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