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qp2/src/cas_based_on_top/two_body_dens_rout.irp.f

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Fortran
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subroutine give_n2_ii_val_ab(r1,r2,two_bod_dens)
implicit none
BEGIN_DOC
! contribution from purely inactive orbitals to n2_{\Psi^B}(r_1,r_2) for a CAS wave function
END_DOC
double precision, intent(in) :: r1(3),r2(3)
double precision, intent(out):: two_bod_dens
integer :: i,j,m,n,i_m,i_n
integer :: i_i,i_j
double precision, allocatable :: mos_array_inact_r1(:),mos_array_inact_r2(:)
double precision, allocatable :: mos_array_r1(:) , mos_array_r2(:)
! You get all orbitals in r_1 and r_2
allocate(mos_array_r1(mo_num) , mos_array_r2(mo_num) )
call give_all_mos_at_r(r1,mos_array_r1)
call give_all_mos_at_r(r2,mos_array_r2)
! You extract the inactive orbitals
allocate(mos_array_inact_r1(n_inact_orb) , mos_array_inact_r2(n_inact_orb) )
do i_m = 1, n_inact_orb
mos_array_inact_r1(i_m) = mos_array_r1(list_inact(i_m))
enddo
do i_m = 1, n_inact_orb
mos_array_inact_r2(i_m) = mos_array_r2(list_inact(i_m))
enddo
two_bod_dens = 0.d0
! You browse all OCCUPIED ALPHA electrons in the \mathcal{A} space
do m = 1, n_inact_orb ! electron 1
! You browse all OCCUPIED BETA electrons in the \mathcal{A} space
do n = 1, n_inact_orb ! electron 2
! two_bod_dens(r_1,r_2) = n_alpha(r_1) * n_beta(r_2)
two_bod_dens += mos_array_inact_r1(m) * mos_array_inact_r1(m) * mos_array_inact_r2(n) * mos_array_inact_r2(n)
enddo
enddo
end
subroutine give_n2_ia_val_ab(r1,r2,two_bod_dens,istate)
BEGIN_DOC
! contribution from inactive and active orbitals to n2_{\Psi^B}(r_1,r_2) for the "istate" state of a CAS wave function
END_DOC
implicit none
integer, intent(in) :: istate
double precision, intent(in) :: r1(3),r2(3)
double precision, intent(out):: two_bod_dens
integer :: i,orb_i,a,orb_a,n,m,b
double precision :: rho
double precision, allocatable :: mos_array_r1(:) , mos_array_r2(:)
double precision, allocatable :: mos_array_inact_r1(:),mos_array_inact_r2(:)
double precision, allocatable :: mos_array_act_r1(:),mos_array_act_r2(:)
two_bod_dens = 0.d0
! You get all orbitals in r_1 and r_2
allocate(mos_array_r1(mo_num) , mos_array_r2(mo_num) )
call give_all_mos_at_r(r1,mos_array_r1)
call give_all_mos_at_r(r2,mos_array_r2)
! You extract the inactive orbitals
allocate( mos_array_inact_r1(n_inact_orb) , mos_array_inact_r2(n_inact_orb) )
do i = 1, n_inact_orb
mos_array_inact_r1(i) = mos_array_r1(list_inact(i))
enddo
do i= 1, n_inact_orb
mos_array_inact_r2(i) = mos_array_r2(list_inact(i))
enddo
! You extract the active orbitals
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allocate( mos_array_act_r1(n_act_orb) , mos_array_act_r2(n_act_orb) )
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do i= 1, n_act_orb
mos_array_act_r1(i) = mos_array_r1(list_act(i))
enddo
do i= 1, n_act_orb
mos_array_act_r2(i) = mos_array_r2(list_act(i))
enddo
! Contracted density : intermediate quantity
two_bod_dens = 0.d0
do a = 1, n_act_orb
do i = 1, n_inact_orb
do b = 1, n_act_orb
rho = one_e_act_dm_beta_mo_for_dft(b,a,istate) + one_e_act_dm_alpha_mo_for_dft(b,a,istate)
two_bod_dens += mos_array_inact_r1(i) * mos_array_inact_r1(i) * mos_array_act_r2(a) * mos_array_act_r2(b) * rho
enddo
enddo
enddo
end
subroutine give_n2_aa_val_ab(r1,r2,two_bod_dens,istate)
BEGIN_DOC
! contribution from purely active orbitals to n2_{\Psi^B}(r_1,r_2) for the "istate" state of a CAS wave function
END_DOC
implicit none
integer, intent(in) :: istate
double precision, intent(in) :: r1(3),r2(3)
double precision, intent(out):: two_bod_dens
integer :: i,orb_i,a,orb_a,n,m,b,c,d
double precision :: rho
double precision, allocatable :: mos_array_r1(:) , mos_array_r2(:)
double precision, allocatable :: mos_array_act_r1(:),mos_array_act_r2(:)
two_bod_dens = 0.d0
! You get all orbitals in r_1 and r_2
allocate(mos_array_r1(mo_num) , mos_array_r2(mo_num) )
call give_all_mos_at_r(r1,mos_array_r1)
call give_all_mos_at_r(r2,mos_array_r2)
! You extract the active orbitals
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allocate( mos_array_act_r1(n_act_orb) , mos_array_act_r2(n_act_orb) )
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do i= 1, n_act_orb
mos_array_act_r1(i) = mos_array_r1(list_act(i))
enddo
do i= 1, n_act_orb
mos_array_act_r2(i) = mos_array_r2(list_act(i))
enddo
! Contracted density : intermediate quantity
two_bod_dens = 0.d0
do a = 1, n_act_orb ! 1
do b = 1, n_act_orb ! 2
do c = 1, n_act_orb ! 1
do d = 1, n_act_orb ! 2
rho = mos_array_act_r1(c) * mos_array_act_r2(d) * act_2_rdm_ab_mo(d,c,b,a,istate)
two_bod_dens += rho * mos_array_act_r1(a) * mos_array_act_r2(b)
enddo
enddo
enddo
enddo
end
subroutine give_n2_cas(r1,r2,istate,n2_psi)
implicit none
BEGIN_DOC
! returns mu(r), f_psi, n2_psi for a general cas wave function
END_DOC
integer, intent(in) :: istate
double precision, intent(in) :: r1(3),r2(3)
double precision, intent(out) :: n2_psi
double precision :: two_bod_dens_ii
double precision :: two_bod_dens_ia
double precision :: two_bod_dens_aa
! inactive-inactive part of n2_psi(r1,r2)
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call give_n2_ii_val_ab(r1,r2,two_bod_dens_ii)
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! inactive-active part of n2_psi(r1,r2)
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call give_n2_ia_val_ab(r1,r2,two_bod_dens_ia,istate)
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! active-active part of n2_psi(r1,r2)
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call give_n2_aa_val_ab(r1,r2,two_bod_dens_aa,istate)
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n2_psi = two_bod_dens_ii + two_bod_dens_ia + two_bod_dens_aa
end