1(*
2 Copyright (C) 2017 M.A.L. Marques
3
4 This Source Code Form is subject to the terms of the Mozilla Public
5 License, v. 2.0. If a copy of the MPL was not distributed with this
6 file, You can obtain one at http://mozilla.org/MPL/2.0/.
7*)
8
9(* type: gga_exc *)
10
11pbea_mu    := 0.00361218645365094697:
12pbea_alpha := 0.52:
13
14pbea_f  := x -> 1 + KAPPA_PBE*(1 - (1 + pbea_mu*x^2/(pbea_alpha*KAPPA_PBE))^(-pbea_alpha)):
15
16
17f := (rs, z, xt, xs0, xs1) -> gga_exchange(pbea_f, rs, z, xs0, xs1):
18