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qp2/src/ao_one_e_ints/one_e_Coul_integrals_cosgtos.irp.f
Anthony Scemama 77186e0560
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Cleaned cosgtos
2023-06-01 11:11:29 +02:00

536 lines
13 KiB
Fortran

! ---
BEGIN_PROVIDER [ double precision, ao_integrals_n_e_cosgtos, (ao_num, ao_num)]
BEGIN_DOC
!
! Nucleus-electron interaction, in the cosgtos |AO| basis set.
!
! :math:`\langle \chi_i | -\sum_A \frac{1}{|r-R_A|} | \chi_j \rangle`
!
END_DOC
implicit none
integer :: num_A, num_B, power_A(3), power_B(3)
integer :: i, j, k, l, n_pt_in, m
double precision :: c, Z, A_center(3), B_center(3), C_center(3)
complex*16 :: alpha, beta, c1, c2
complex*16 :: NAI_pol_mult_cosgtos
ao_integrals_n_e_cosgtos = 0.d0
!$OMP PARALLEL &
!$OMP DEFAULT (NONE) &
!$OMP PRIVATE ( i, j, k, l, m, alpha, beta, A_center, B_center, C_center &
!$OMP , power_A, power_B, num_A, num_B, Z, c, c1, c2, n_pt_in ) &
!$OMP SHARED ( ao_num, ao_prim_num, ao_nucl, nucl_coord, ao_power, nucl_num, nucl_charge &
!$OMP , ao_expo_ord_transp_cosgtos, ao_coef_norm_ord_transp_cosgtos &
!$OMP , n_pt_max_integrals, ao_integrals_n_e_cosgtos )
n_pt_in = n_pt_max_integrals
!$OMP DO SCHEDULE (dynamic)
do j = 1, ao_num
num_A = ao_nucl(j)
power_A(1:3) = ao_power(j,1:3)
A_center(1:3) = nucl_coord(num_A,1:3)
do i = 1, ao_num
num_B = ao_nucl(i)
power_B(1:3) = ao_power(i,1:3)
B_center(1:3) = nucl_coord(num_B,1:3)
do l = 1, ao_prim_num(j)
alpha = ao_expo_ord_transp_cosgtos(l,j)
do m = 1, ao_prim_num(i)
beta = ao_expo_ord_transp_cosgtos(m,i)
c = 0.d0
do k = 1, nucl_num
Z = nucl_charge(k)
C_center(1:3) = nucl_coord(k,1:3)
!print *, ' '
!print *, A_center, B_center, C_center, power_A, power_B
!print *, real(alpha), real(beta)
c1 = NAI_pol_mult_cosgtos( A_center, B_center, power_A, power_B &
, alpha, beta, C_center, n_pt_in )
!c2 = c1
c2 = NAI_pol_mult_cosgtos( A_center, B_center, power_A, power_B &
, conjg(alpha), beta, C_center, n_pt_in )
!print *, ' c1 = ', real(c1)
!print *, ' c2 = ', real(c2)
c = c - Z * 2.d0 * real(c1 + c2)
enddo
ao_integrals_n_e_cosgtos(i,j) = ao_integrals_n_e_cosgtos(i,j) &
+ ao_coef_norm_ord_transp_cosgtos(l,j) &
* ao_coef_norm_ord_transp_cosgtos(m,i) * c
enddo
enddo
enddo
enddo
!$OMP END DO
!$OMP END PARALLEL
END_PROVIDER
! ---
complex*16 function NAI_pol_mult_cosgtos(A_center, B_center, power_A, power_B, alpha, beta, C_center, n_pt_in)
BEGIN_DOC
!
! Computes the electron-nucleus attraction with two primitves cosgtos.
!
! :math:`\langle g_i | \frac{1}{|r-R_c|} | g_j \rangle`
!
END_DOC
implicit none
include 'utils/constants.include.F'
integer, intent(in) :: n_pt_in, power_A(3), power_B(3)
double precision, intent(in) :: C_center(3), A_center(3), B_center(3)
complex*16, intent(in) :: alpha, beta
integer :: i, n_pt, n_pt_out
double precision :: dist, const_mod
complex*16 :: p, p_inv, rho, dist_integral, const, const_factor, coeff, factor
complex*16 :: accu, P_center(3)
complex*16 :: d(0:n_pt_in)
complex*16 :: V_n_e_cosgtos
complex*16 :: crint
if ( (A_center(1)/=B_center(1)) .or. (A_center(2)/=B_center(2)) .or. (A_center(3)/=B_center(3)) .or. &
(A_center(1)/=C_center(1)) .or. (A_center(2)/=C_center(2)) .or. (A_center(3)/=C_center(3)) ) then
continue
else
NAI_pol_mult_cosgtos = V_n_e_cosgtos( power_A(1), power_A(2), power_A(3) &
, power_B(1), power_B(2), power_B(3) &
, alpha, beta )
return
endif
p = alpha + beta
p_inv = (1.d0, 0.d0) / p
rho = alpha * beta * p_inv
dist = 0.d0
dist_integral = (0.d0, 0.d0)
do i = 1, 3
P_center(i) = (alpha * A_center(i) + beta * B_center(i)) * p_inv
dist += (A_center(i) - B_center(i)) * (A_center(i) - B_center(i))
dist_integral += (P_center(i) - C_center(i)) * (P_center(i) - C_center(i))
enddo
const_factor = dist * rho
const = p * dist_integral
const_mod = dsqrt(real(const_factor)*real(const_factor) + aimag(const_factor)*aimag(const_factor))
if(const_mod > 80.d0) then
NAI_pol_mult_cosgtos = (0.d0, 0.d0)
return
endif
factor = zexp(-const_factor)
coeff = dtwo_pi * factor * p_inv
do i = 0, n_pt_in
d(i) = (0.d0, 0.d0)
enddo
n_pt = 2 * ( (power_A(1) + power_B(1)) + (power_A(2) + power_B(2)) + (power_A(3) + power_B(3)) )
if(n_pt == 0) then
NAI_pol_mult_cosgtos = coeff * crint(0, const)
return
endif
call give_cpolynomial_mult_center_one_e( A_center, B_center, alpha, beta &
, power_A, power_B, C_center, n_pt_in, d, n_pt_out)
if(n_pt_out < 0) then
NAI_pol_mult_cosgtos = (0.d0, 0.d0)
return
endif
accu = (0.d0, 0.d0)
do i = 0, n_pt_out, 2
accu += crint(shiftr(i, 1), const) * d(i)
! print *, shiftr(i, 1), real(const), real(d(i)), real(crint(shiftr(i, 1), const))
enddo
NAI_pol_mult_cosgtos = accu * coeff
end function NAI_pol_mult_cosgtos
! ---
subroutine give_cpolynomial_mult_center_one_e( A_center, B_center, alpha, beta &
, power_A, power_B, C_center, n_pt_in, d, n_pt_out)
BEGIN_DOC
! Returns the explicit polynomial in terms of the "t" variable of the following
!
! $I_{x1}(a_x, d_x,p,q) \times I_{x1}(a_y, d_y,p,q) \times I_{x1}(a_z, d_z,p,q)$.
END_DOC
implicit none
integer, intent(in) :: n_pt_in, power_A(3), power_B(3)
double precision, intent(in) :: A_center(3), B_center(3), C_center(3)
complex*16, intent(in) :: alpha, beta
integer, intent(out) :: n_pt_out
complex*16, intent(out) :: d(0:n_pt_in)
integer :: a_x, b_x, a_y, b_y, a_z, b_z
integer :: n_pt1, n_pt2, n_pt3, dim, i, n_pt_tmp
complex*16 :: p, P_center(3), rho, p_inv, p_inv_2
complex*16 :: R1x(0:2), B01(0:2), R1xp(0:2),R2x(0:2)
complex*16 :: d1(0:n_pt_in), d2(0:n_pt_in), d3(0:n_pt_in)
ASSERT (n_pt_in > 1)
p = alpha + beta
p_inv = (1.d0, 0.d0) / p
p_inv_2 = 0.5d0 * p_inv
do i = 1, 3
P_center(i) = (alpha * A_center(i) + beta * B_center(i)) * p_inv
enddo
do i = 0, n_pt_in
d(i) = (0.d0, 0.d0)
d1(i) = (0.d0, 0.d0)
d2(i) = (0.d0, 0.d0)
d3(i) = (0.d0, 0.d0)
enddo
! ---
n_pt1 = n_pt_in
R1x(0) = (P_center(1) - A_center(1))
R1x(1) = (0.d0, 0.d0)
R1x(2) = -(P_center(1) - C_center(1))
R1xp(0) = (P_center(1) - B_center(1))
R1xp(1) = (0.d0, 0.d0)
R1xp(2) = -(P_center(1) - C_center(1))
R2x(0) = p_inv_2
R2x(1) = (0.d0, 0.d0)
R2x(2) = -p_inv_2
a_x = power_A(1)
b_x = power_B(1)
call I_x1_pol_mult_one_e_cosgtos(a_x, b_x, R1x, R1xp, R2x, d1, n_pt1, n_pt_in)
if(n_pt1 < 0) then
n_pt_out = -1
do i = 0, n_pt_in
d(i) = (0.d0, 0.d0)
enddo
return
endif
! ---
n_pt2 = n_pt_in
R1x(0) = (P_center(2) - A_center(2))
R1x(1) = (0.d0, 0.d0)
R1x(2) = -(P_center(2) - C_center(2))
R1xp(0) = (P_center(2) - B_center(2))
R1xp(1) = (0.d0, 0.d0)
R1xp(2) = -(P_center(2) - C_center(2))
a_y = power_A(2)
b_y = power_B(2)
call I_x1_pol_mult_one_e_cosgtos(a_y, b_y, R1x, R1xp, R2x, d2, n_pt2, n_pt_in)
if(n_pt2 < 0) then
n_pt_out = -1
do i = 0, n_pt_in
d(i) = (0.d0, 0.d0)
enddo
return
endif
! ---
n_pt3 = n_pt_in
R1x(0) = (P_center(3) - A_center(3))
R1x(1) = (0.d0, 0.d0)
R1x(2) = -(P_center(3) - C_center(3))
R1xp(0) = (P_center(3) - B_center(3))
R1xp(1) = (0.d0, 0.d0)
R1xp(2) = -(P_center(3) - C_center(3))
a_z = power_A(3)
b_z = power_B(3)
call I_x1_pol_mult_one_e_cosgtos(a_z, b_z, R1x, R1xp, R2x, d3, n_pt3, n_pt_in)
if(n_pt3 < 0) then
n_pt_out = -1
do i = 0, n_pt_in
d(i) = (0.d0, 0.d0)
enddo
return
endif
! ---
n_pt_tmp = 0
call multiply_cpoly(d1, n_pt1, d2, n_pt2, d, n_pt_tmp)
do i = 0, n_pt_tmp
d1(i) = (0.d0, 0.d0)
enddo
n_pt_out = 0
call multiply_cpoly(d, n_pt_tmp, d3, n_pt3, d1, n_pt_out)
do i = 0, n_pt_out
d(i) = d1(i)
enddo
end subroutine give_cpolynomial_mult_center_one_e
! ---
recursive subroutine I_x1_pol_mult_one_e_cosgtos(a, c, R1x, R1xp, R2x, d, nd, n_pt_in)
BEGIN_DOC
! Recursive routine involved in the electron-nucleus potential
END_DOC
implicit none
include 'utils/constants.include.F'
integer, intent(in) :: a, c, n_pt_in
complex*16, intent(in) :: R1x(0:2), R1xp(0:2), R2x(0:2)
integer, intent(inout) :: nd
complex*16, intent(inout) :: d(0:n_pt_in)
integer :: nx, ix, dim, iy, ny
complex*16 :: X(0:max_dim)
complex*16 :: Y(0:max_dim)
!DIR$ ATTRIBUTES ALIGN : $IRP_ALIGN :: X, Y
dim = n_pt_in
if( (a==0) .and. (c==0)) then
nd = 0
d(0) = (1.d0, 0.d0)
return
elseif( (c < 0) .or. (nd < 0) ) then
nd = -1
return
elseif((a == 0) .and. (c .ne. 0)) then
call I_x2_pol_mult_one_e_cosgtos(c, R1x, R1xp, R2x, d, nd, n_pt_in)
elseif(a == 1) then
nx = nd
do ix = 0, n_pt_in
X(ix) = (0.d0, 0.d0)
Y(ix) = (0.d0, 0.d0)
enddo
call I_x2_pol_mult_one_e_cosgtos(c-1, R1x, R1xp, R2x, X, nx, n_pt_in)
do ix = 0, nx
X(ix) *= dble(c)
enddo
call multiply_cpoly(X, nx, R2x, 2, d, nd)
ny = 0
call I_x2_pol_mult_one_e_cosgtos(c, R1x, R1xp, R2x, Y, ny, n_pt_in)
call multiply_cpoly(Y, ny, R1x, 2, d, nd)
else
nx = 0
do ix = 0, n_pt_in
X(ix) = (0.d0, 0.d0)
Y(ix) = (0.d0, 0.d0)
enddo
call I_x1_pol_mult_one_e_cosgtos(a-2, c, R1x, R1xp, R2x, X, nx, n_pt_in)
do ix = 0, nx
X(ix) *= dble(a-1)
enddo
call multiply_cpoly(X, nx, R2x, 2, d, nd)
nx = nd
do ix = 0, n_pt_in
X(ix) = (0.d0, 0.d0)
enddo
call I_x1_pol_mult_one_e_cosgtos(a-1, c-1, R1x, R1xp, R2x, X, nx, n_pt_in)
do ix = 0, nx
X(ix) *= dble(c)
enddo
call multiply_cpoly(X, nx, R2x, 2, d, nd)
ny = 0
call I_x1_pol_mult_one_e_cosgtos(a-1, c, R1x, R1xp, R2x, Y, ny, n_pt_in)
call multiply_cpoly(Y, ny, R1x, 2, d, nd)
endif
end subroutine I_x1_pol_mult_one_e_cosgtos
! ---
recursive subroutine I_x2_pol_mult_one_e_cosgtos(c, R1x, R1xp, R2x, d, nd, dim)
BEGIN_DOC
! Recursive routine involved in the electron-nucleus potential
END_DOC
implicit none
include 'utils/constants.include.F'
integer, intent(in) :: dim, c
complex*16, intent(in) :: R1x(0:2), R1xp(0:2), R2x(0:2)
integer, intent(inout) :: nd
complex*16, intent(out) :: d(0:max_dim)
integer :: i, nx, ix, ny
complex*16 :: X(0:max_dim), Y(0:max_dim)
!DIR$ ATTRIBUTES ALIGN : $IRP_ALIGN :: X, Y
if(c == 0) then
nd = 0
d(0) = (1.d0, 0.d0)
return
elseif((nd < 0) .or. (c < 0)) then
nd = -1
return
else
nx = 0
do ix = 0, dim
X(ix) = (0.d0, 0.d0)
Y(ix) = (0.d0, 0.d0)
enddo
call I_x1_pol_mult_one_e_cosgtos(0, c-2, R1x, R1xp, R2x, X, nx, dim)
do ix = 0, nx
X(ix) *= dble(c-1)
enddo
call multiply_cpoly(X, nx, R2x, 2, d, nd)
ny = 0
do ix = 0, dim
Y(ix) = (0.d0, 0.d0)
enddo
call I_x1_pol_mult_one_e_cosgtos(0, c-1, R1x, R1xp, R2x, Y, ny, dim)
if(ny .ge. 0) then
call multiply_cpoly(Y, ny, R1xp, 2, d, nd)
endif
endif
end subroutine I_x2_pol_mult_one_e_cosgtos
! ---
complex*16 function V_n_e_cosgtos(a_x, a_y, a_z, b_x, b_y, b_z, alpha, beta)
BEGIN_DOC
! Primitve nuclear attraction between the two primitves centered on the same atom.
!
! $p_1 = x^{a_x} y^{a_y} z^{a_z} \exp(-\alpha r^2)$
!
! $p_2 = x^{b_x} y^{b_y} z^{b_z} \exp(-\beta r^2)$
END_DOC
implicit none
integer, intent(in) :: a_x, a_y, a_z, b_x, b_y, b_z
complex*16, intent(in) :: alpha, beta
double precision :: V_phi, V_theta
complex*16 :: V_r_cosgtos
if( (iand(a_x + b_x, 1) == 1) .or. &
(iand(a_y + b_y, 1) == 1) .or. &
(iand(a_z + b_z, 1) == 1) ) then
V_n_e_cosgtos = (0.d0, 0.d0)
else
V_n_e_cosgtos = V_r_cosgtos(a_x + b_x + a_y + b_y + a_z + b_z + 1, alpha + beta) &
* V_phi(a_x + b_x, a_y + b_y) &
* V_theta(a_z + b_z, a_x + b_x + a_y + b_y + 1)
endif
end function V_n_e_cosgtos
! ---
complex*16 function V_r_cosgtos(n, alpha)
BEGIN_DOC
! Computes the radial part of the nuclear attraction integral:
!
! $\int_{0}^{\infty} r^n \exp(-\alpha r^2) dr$
!
END_DOC
implicit none
include 'utils/constants.include.F'
integer , intent(in) :: n
complex*16, intent(in) :: alpha
double precision :: fact
if(iand(n, 1) .eq. 1) then
V_r_cosgtos = 0.5d0 * fact(shiftr(n, 1)) / (alpha**(shiftr(n, 1) + 1))
else
V_r_cosgtos = sqpi * fact(n) / fact(shiftr(n, 1)) * (0.5d0/zsqrt(alpha))**(n+1)
endif
end function V_r_cosgtos
! ---