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mirror of https://github.com/LCPQ/quantum_package synced 2024-12-23 04:43:50 +01:00

Perturbation OK. Need to add tests

This commit is contained in:
Anthony Scemama 2014-05-18 22:46:38 +02:00
parent 80f863ef3a
commit 0ddfe658cc
5 changed files with 123 additions and 0 deletions

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* This is not allowed:
subroutine &
pt2_....

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default: all
# Define here all new external source files and objects.Don't forget to prefix the
# object files with IRPF90_temp/
SRC=perturbation_template.f
OBJ=
include $(QPACKAGE_ROOT)/src/Makefile.common

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AOs BiInts Bitmask Dets Electrons Ezfio_files Hartree_Fock MonoInts MOs Nuclei Output Utils

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subroutine pt2_epstein_nesbet(det_pert,c_pert,e_2_pert,H_pert_diag,Nint,ndet,n_st)
use bitmasks
implicit none
integer, intent(in) :: Nint,ndet,n_st
integer(bit_kind), intent(in) :: det_pert(Nint,2)
double precision , intent(out) :: c_pert(n_st),e_2_pert(n_st),H_pert_diag
double precision :: i_H_psi_array(N_st)
BEGIN_DOC
! compute the standard Epstein-Nesbet perturbative first order coefficient and second order energetic contribution
!
! for the various n_st states.
!
! c_pert(i) = <psi(i)|H|det_pert>/( E(i) - <det_pert|H|det_pert> )
!
! e_2_pert(i) = <psi(i)|H|det_pert>^2/( E(i) - <det_pert|H|det_pert> )
!
END_DOC
integer :: i,j
double precision :: diag_H_mat_elem
ASSERT (Nint == N_int)
ASSERT (Nint > 0)
call i_H_psi(det_pert,psi_ref,psi_ref_coef,Nint,ndet,psi_ref_size,n_st,i_H_psi_array)
H_pert_diag = diag_H_mat_elem(det_pert,Nint)
do i =1,n_st
c_pert(i) = i_H_psi_array(i) / (E_ref(i) - H_pert_diag)
e_2_pert(i) = c_pert(i) * i_H_psi_array(i)
enddo
end
subroutine pt2_epstein_nesbet_2x2(det_pert,c_pert,e_2_pert,H_pert_diag,Nint,ndet,n_st)
use bitmasks
implicit none
integer, intent(in) :: Nint,ndet,n_st
integer(bit_kind), intent(in) :: det_pert(Nint,2)
double precision , intent(out) :: c_pert(n_st),e_2_pert(n_st),H_pert_diag
double precision :: i_H_psi_array(N_st)
BEGIN_DOC
! compute the Epstein-Nesbet 2x2 diagonalization coefficient and energetic contribution
!
! for the various n_st states.
!
! e_2_pert(i) = 0.5 * (( <det_pert|H|det_pert> - E(i) ) - sqrt( ( <det_pert|H|det_pert> - E(i)) ^2 + 4 <psi(i)|H|det_pert>^2 )
!
! c_pert(i) = e_2_pert(i)/ <psi(i)|H|det_pert>
!
END_DOC
integer :: i,j
double precision :: diag_H_mat_elem,delta_e
ASSERT (Nint == N_int)
ASSERT (Nint > 0)
call i_H_psi(det_pert,psi_ref,psi_ref_coef,Nint,ndet,psi_ref_size,n_st,i_H_psi_array)
H_pert_diag = diag_H_mat_elem(det_pert,Nint)
do i =1,n_st
delta_e = H_pert_diag - E_ref(i)
e_2_pert(i) = 0.5d0 * (delta_e - dsqrt(delta_e * delta_e + 4.d0 * i_H_psi_array(i) * i_H_psi_array(i)))
c_pert(i) = e_2_pert(i)/i_H_psi_array(i)
enddo
end

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BEGIN_SHELL [ /usr/bin/env python ]
import perturbation
END_SHELL
subroutine perturb_buffer_$PERT(buffer,buffer_size,sum_e_2_pert,sum_norm_pert,sum_H_pert_diag,N_st,Nint)
implicit none
BEGIN_DOC
! Applly pertubration ``$PERT`` to the buffer of determinants generated in the H_apply
! routine.
END_DOC
integer, intent(in) :: Nint, N_st, buffer_size
integer(bit_kind), intent(in) :: buffer(Nint,2,buffer_size)
double precision, intent(inout) :: sum_norm_pert(N_st),sum_e_2_pert(N_st),sum_H_pert_diag(N_st)
double precision :: c_pert(N_st), e_2_pert(N_st), H_pert_diag
integer :: i,k, c_ref
integer :: connected_to_ref
ASSERT (Nint > 0)
ASSERT (Nint == N_int)
ASSERT (buffer_size >= 0)
ASSERT (minval(sum_norm_pert) >= 0.d0)
ASSERT (N_st > 0)
do i = 1,buffer_size
c_ref = connected_to_ref(buffer(1,1,i),psi_det,Nint,N_det_ref,N_det,h_apply_threshold)
if (c_ref /= 0) then
cycle
endif
call pt2_$PERT(buffer(1,1,i), &
c_pert,e_2_pert,H_pert_diag,Nint,n_det_ref,n_st)
do k = 1,N_st
sum_norm_pert(k) += c_pert(k) * c_pert(k)
sum_e_2_pert(k) += e_2_pert(k)
sum_H_pert_diag(k) += c_pert(k) * c_pert(k) * H_pert_diag
enddo
enddo
end