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qp2/src/csf/configuration_CI_sigma_helpers.irp.f

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Fortran
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function getNSOMO(Icfg) result(NSOMO)
implicit none
integer(bit_kind),intent(in) :: Icfg(N_int,2)
integer :: NSOMO
integer :: i
NSOMO = 0
do i = 1,N_int
NSOMO += POPCNT(Icfg(i,1))
enddo
end function getNSOMO
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subroutine convertOrbIdsToModelSpaceIds(Ialpha, Jcfg, p, q, extype, pmodel, qmodel)
implicit none
BEGIN_DOC
! This function converts the orbital ids
! in real space to those used in model space
! in order to identify the matrices required
! for the calculation of MEs.
!
! The type of excitations are ordered as follows:
! Type 1 - SOMO -> SOMO
! Type 2 - DOMO -> VMO
! Type 3 - SOMO -> VMO
! Type 4 - DOMO -> SOMO
END_DOC
integer(bit_kind),intent(in) :: Ialpha(N_int,2)
integer(bit_kind),intent(in) :: Jcfg(N_int,2)
integer,intent(in) :: p,q
integer,intent(in) :: extype
integer,intent(out) :: pmodel,qmodel
integer*8 :: Isomo
integer*8 :: Idomo
integer*8 :: Jsomo
integer*8 :: Jdomo
integer*8 :: mask
integer*8 :: Isomotmp
integer*8 :: Jsomotmp
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integer :: pos0,pos0prev
! TODO Flag (print) when model space indices is > 64
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Isomo = Ialpha(1,1)
Idomo = Ialpha(1,2)
Jsomo = Jcfg(1,1)
Jdomo = Jcfg(1,2)
pos0prev = 0
pmodel = p
qmodel = q
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if(p .EQ. q) then
pmodel = 1
qmodel = 1
else
!print *,"input pq=",p,q,"extype=",extype
!call debug_spindet(Isomo,1)
!call debug_spindet(Idomo,1)
!call debug_spindet(Jsomo,1)
!call debug_spindet(Jdomo,1)
select case(extype)
case (1)
! SOMO -> SOMO
! remove all domos
!print *,"type -> SOMO -> SOMO"
mask = ISHFT(1_8,p) - 1
Isomotmp = IAND(Isomo,mask)
pmodel = POPCNT(mask) - POPCNT(XOR(Isomotmp,mask))
mask = ISHFT(1_8,q) - 1
Isomotmp = IAND(Isomo,mask)
qmodel = POPCNT(mask) - POPCNT(XOR(Isomotmp,mask))
case (2)
! DOMO -> VMO
! remove all domos except one at p
!print *,"type -> DOMO -> VMO"
mask = ISHFT(1_8,p) - 1
Jsomotmp = IAND(Jsomo,mask)
pmodel = POPCNT(mask) - POPCNT(XOR(Jsomotmp,mask))
mask = ISHFT(1_8,q) - 1
Jsomotmp = IAND(Jsomo,mask)
qmodel = POPCNT(mask) - POPCNT(XOR(Jsomotmp,mask))
case (3)
! SOMO -> VMO
!print *,"type -> SOMO -> VMO"
!Isomo = IEOR(Isomo,Jsomo)
mask = ISHFT(1_8,p) - 1
Isomo = IAND(Isomo,mask)
pmodel = POPCNT(mask) - POPCNT(XOR(Isomo,mask))
mask = ISHFT(1_8,q) - 1
Jsomo = IAND(Jsomo,mask)
qmodel = POPCNT(mask) - POPCNT(XOR(Jsomo,mask))
case (4)
! DOMO -> SOMO
! remove all domos except one at p
!print *,"type -> DOMO -> SOMO"
!Isomo = IEOR(Isomo,Jsomo)
mask = ISHFT(1_8,p) - 1
Jsomo = IAND(Jsomo,mask)
pmodel = POPCNT(mask) - POPCNT(XOR(Jsomo,mask))
mask = ISHFT(1_8,q) - 1
Isomo = IAND(Isomo,mask)
qmodel = POPCNT(mask) - POPCNT(XOR(Isomo,mask))
case default
print *,"something is wrong in convertOrbIdsToModelSpaceIds"
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end select
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endif
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!print *,p,q,"model ids=",pmodel,qmodel
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end subroutine convertOrbIdsToModelSpaceIds