BEGIN_PROVIDER [double precision, CI_eigenvectors_sc2_no_amp, (N_det,N_states_diag)]
&BEGIN_PROVIDER [double precision, CI_eigenvectors_s2_sc2_no_amp, (N_states_diag)]
&BEGIN_PROVIDER [double precision, CI_electronic_energy_sc2_no_amp, (N_states_diag)]
   implicit none
   integer                        :: i,j,k,l
   integer, allocatable           :: idx(:)
   double precision, allocatable  :: e_corr(:,:)
   double precision, allocatable  :: accu(:)
   double precision, allocatable  :: ihpsi_current(:)
   double precision, allocatable  :: H_jj(:),H_jj_total(:),S2_jj(:)
   allocate(e_corr(N_det_non_ref,N_states),ihpsi_current(N_states),accu(N_states),H_jj(N_det_non_ref),idx(0:N_det_non_ref))
   allocate(H_jj_total(N_det),S2_jj(N_det))
     accu = 0.d0
     do i = 1, N_det_non_ref
       call i_h_psi(psi_non_ref(1,1,i), psi_ref, psi_ref_coef_interm_norm, N_int, N_det_ref,&
           size(psi_ref_coef_interm_norm,1), N_states,ihpsi_current)
       do j = 1, N_states
         e_corr(i,j) = psi_non_ref_coef_interm_norm(i,j) * ihpsi_current(j)
         accu(j) +=  e_corr(i,j)
       enddo
     enddo
     double precision               :: hjj,diag_h_mat_elem
     do i = 1, N_det_non_ref
       call filter_not_connected(psi_non_ref,psi_non_ref(1,1,i),N_int,N_det_non_ref,idx)
       H_jj(i) = 0.d0
       do j = 1, idx(0)
         H_jj(i) += e_corr(idx(j),1)
       enddo
     enddo
     do i=1,N_Det
       H_jj_total(i) = diag_h_mat_elem(psi_det(1,1,i),N_int)
       call get_s2(psi_det(1,1,i),psi_det(1,1,i),N_int,S2_jj(i))
     enddo
     do i=1, N_det_non_ref
       H_jj_total(idx_non_ref(i)) += H_jj(i)
     enddo
     
     
     call davidson_diag_hjj_sjj(psi_det,CI_eigenvectors_sc2_no_amp,H_jj_total,S2_jj,CI_electronic_energy_sc2_no_amp,size(CI_eigenvectors_sc2_no_amp,1),N_Det,N_states,N_states_diag,N_int,6)
     do i=1,N_states_diag
       CI_eigenvectors_s2_sc2_no_amp(i) = S2_jj(i)
     enddo
     
   deallocate(e_corr,ihpsi_current,accu,H_jj,idx,H_jj_total,s2_jj)
END_PROVIDER 

BEGIN_PROVIDER [ double precision, CI_energy_sc2_no_amp, (N_states_diag) ]
  implicit none
  BEGIN_DOC
  ! N_states lowest eigenvalues of the CI matrix
  END_DOC
  
  integer                        :: j
  character*(8)                  :: st
  call write_time(output_determinants)
  do j=1,min(N_det,N_states_diag)
    CI_energy_sc2_no_amp(j) = CI_electronic_energy_sc2_no_amp(j) + nuclear_repulsion
  enddo
  do j=1,min(N_det,N_states)
    write(st,'(I4)') j
    call write_double(output_determinants,CI_energy_sc2_no_amp(j),'Energy of state '//trim(st))
    call write_double(output_determinants,CI_eigenvectors_s2_sc2_no_amp(j),'S^2 of state '//trim(st))
  enddo

END_PROVIDER

subroutine diagonalize_CI_sc2_no_amp
 implicit none
  integer :: i,j
  do j=1,N_states
    do i=1,N_det
      psi_coef(i,j) = CI_eigenvectors_sc2_no_amp(i,j)
    enddo
  enddo
  SOFT_TOUCH  ci_eigenvectors_s2_sc2_no_amp ci_eigenvectors_sc2_no_amp ci_electronic_energy_sc2_no_amp ci_energy_sc2_no_amp psi_coef 

end