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100 lines
2.7 KiB
OCaml
100 lines
2.7 KiB
OCaml
(** Electron-nucleus repulsion integrals *)
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include Common
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include Particles
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include Linear_algebra
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include Gaussian
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open Util
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open Constants
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module Am = Angular_momentum
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module Bs = Basis
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module Cs = Contracted_shell
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type t = (Bs.t, Bs.t) Matrix.t
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(** (0|0)^m : Fundamental electron-nucleus repulsion integral
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$ \int \phi_p(r1) 1/r_{C} dr_1 $
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maxm : Maximum total angular momentum
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expo_pq_inv : $1./p + 1./q$ where $p$ and $q$ are the exponents of
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$\phi_p$ and $\phi_q$
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norm_pq_sq : square of the distance between the centers of $\phi_p$
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and $\phi_q$
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*)
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let zero_m ~maxm ~expo_pq_inv ~norm_pq_sq =
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let exp_pq = 1. /. expo_pq_inv in
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let t = norm_pq_sq *. exp_pq in
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boys_function ~maxm t
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|> Array.mapi (fun m fm ->
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two_over_sq_pi *. fm *.
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(pow exp_pq m) *. (sqrt exp_pq)
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)
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(** Compute all the integrals of a contracted class *)
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let contracted_class_shell_pair shell_p geometry: float Zmap.t =
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One_electron_rr.contracted_class_shell_pair ~zero_m shell_p geometry
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let of_basis_nuclei ~basis nuclei =
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let to_powers x =
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let open Zkey in
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match to_powers x with
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| Three x -> x
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| _ -> assert false
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in
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let n = Bs.size basis
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and shell = Bs.contracted_shells basis
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in
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let eni_array = Matrix.create n n in
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(* Pre-compute all shell pairs *)
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let shell_pairs =
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Array.mapi (fun i shell_a -> Array.map (fun shell_b ->
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Contracted_shell_pair.make shell_a shell_b) (Array.sub shell 0 (i+1)) ) shell
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in
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(* Compute Integrals *)
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for i=0 to (Array.length shell) - 1 do
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for j=0 to i do
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match shell_pairs.(i).(j) with
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| None -> ()
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| Some shell_p ->
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(* Compute all the integrals of the class *)
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let cls =
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contracted_class_shell_pair shell_p nuclei
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in
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(* Write the data in the output file *)
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Array.iteri (fun i_c powers_i ->
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let i_c = Cs.index shell.(i) + i_c + 1 in
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let xi = to_powers powers_i in
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Array.iteri (fun j_c powers_j ->
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let j_c = Cs.index shell.(j) + j_c + 1 in
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let xj = to_powers powers_j in
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let key =
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Zkey.of_powers_six xi xj
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in
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let value =
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Zmap.find cls key
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in
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Matrix.set eni_array j_c i_c value;
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Matrix.set eni_array i_c j_c value;
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) (Am.zkey_array (Singlet (Cs.ang_mom shell.(j))))
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) (Am.zkey_array (Singlet (Cs.ang_mom shell.(i))))
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done;
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done;
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Matrix.detri_inplace eni_array;
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eni_array
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let of_basis _basis =
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invalid_arg "of_basis_nuclei should be called for NucInt"
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let of_basis_pair _basis =
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failwith "Not implemented"
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