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mirror of https://github.com/TREX-CoE/irpjast.git synced 2024-12-24 21:34:04 +01:00
irpjast/nuclei.irp.f

152 lines
3.5 KiB
Fortran

BEGIN_PROVIDER [ integer, nnuc ]
implicit none
BEGIN_DOC
! Number of nuclei
END_DOC
!nnuc = 2
! read(*,*)nnuc
nnuc = nelec/5
END_PROVIDER
BEGIN_PROVIDER [ integer, nnuc_8 ]
implicit none
integer, external :: size_8
nnuc_8 = size_8(nnuc)
END_PROVIDER
BEGIN_PROVIDER [ integer, typenuc ]
&BEGIN_PROVIDER [integer, typenuc_arr, (nnuc)]
implicit none
BEGIN_DOC
! Type of the nuclei
END_DOC
typenuc = 1
!typenuc_arr = (/1, 1/)
typenuc_arr = 1
END_PROVIDER
BEGIN_PROVIDER [ double precision, nuc_coord, (nnuc, 3) ]
implicit none
BEGIN_DOC
! Nuclei coordinates
END_DOC
character(len=*), parameter :: FILE_NAME = "geometry.txt"
integer :: fu, rc, i
open(action='read', file=FILE_NAME, iostat=rc, newunit=fu)
do i = 1, nnuc
read(fu, *) nuc_coord(i, :)
end do
close(fu)
END_PROVIDER
BEGIN_PROVIDER [ double precision, elnuc_dist, (nelec, nnuc) ]
implicit none
BEGIN_DOC
! e-n distance
END_DOC
integer :: i, j
double precision :: x, y, z
do j = 1, nnuc
do i = 1, nelec
x = elec_coord(i, 1) - nuc_coord(j, 1)
y = elec_coord(i, 2) - nuc_coord(j, 2)
z = elec_coord(i, 3) - nuc_coord(j, 3)
elnuc_dist(i, j) = dsqrt( x*x + y*y + z*z )
enddo
enddo
END_PROVIDER
BEGIN_PROVIDER [double precision, factor_en]
implicit none
BEGIN_DOC
! Electron-nuclei contribution to Jastrow factor
END_DOC
integer :: i, a, p
double precision :: pow_ser, x
factor_en = 0.0d0
do a = 1 , nnuc
do i = 1, nelec
x = rescale_en(i, a)
pow_ser = 0.0d0
do p = 2, naord
x = x * rescale_en(i, a)
pow_ser = pow_ser + aord_vect(p + 1, typenuc_arr(a)) * x
end do
factor_en = factor_en + aord_vect(1, typenuc_arr(a)) * rescale_en(i, a) &
/ (1.0d0 + aord_vect(2, typenuc_arr(a)) * rescale_en(i, a)) + pow_ser
end do
end do
END_PROVIDER
BEGIN_PROVIDER [double precision, factor_en_deriv_e, (4, nelec) ]
implicit none
BEGIN_DOC
! Dimensions 1-3 : dx, dy, dz
! Dimension 4 : d2x + d2y + d2z
END_DOC
integer :: i, ii, a, p
double precision :: x, x_inv, y, den, invden, lap1, lap2, lap3, third
double precision, dimension(3) :: pow_ser_g
double precision, dimension(4) :: dx
factor_en_deriv_e = 0.0d0
third = 1.0d0 / 3.0d0
do a = 1 , nnuc
do i = 1, nelec
pow_ser_g = 0.0d0
den = 1.0d0 + aord_vect(2, typenuc_arr(a)) * rescale_en(i, a)
invden = 1.0d0 / den
x_inv = 1.0d0 / rescale_en(i, a)
do ii = 1, 4
dx(ii) = rescale_en_deriv_e(ii, i, a)
enddo
lap1 = 0.0d0
lap2 = 0.0d0
lap3 = 0.0d0
do ii = 1, 3
x = rescale_en(i, a)
do p = 2, naord
! p a_{p+1} r[i,a]^(p-1)
y = p * aord_vect(p + 1, typenuc_arr(a)) * x
pow_ser_g(ii) += y * dx(ii)
! (p-1) p a_{p+1} r[i,a]^(p-2) r'[i,a]^2
lap1 += (p - 1) * y * x_inv * dx(ii) * dx(ii)
! p a_{p+1} r[i,a]^(p-1) r''[i,a]
lap2 += y
x = x * rescale_en(i, a)
end do
! (a1 (-2 a2 r'[i,a]^2+(1+a2 r[i,a]) r''[i,a]))/(1+a2 r[i,a])^3
lap3 += -2.0d0 * aord_vect(2, typenuc_arr(a)) * dx(ii) * dx(ii)
! \frac{a1 * r'(i,a)}{(a2 * r(i,a)+1)^2}
factor_en_deriv_e(ii, i) += aord_vect(1, typenuc_arr(a)) &
* dx(ii) * invden * invden + pow_ser_g(ii)
enddo
ii = 4
lap2 *= dx(ii) * third
lap3 += den * dx(ii)
lap3 *= aord_vect(1, typenuc_arr(a)) * invden * invden * invden
factor_en_deriv_e(ii, i) += lap1 + lap2 + lap3
end do
end do
END_PROVIDER