Regular Article

Convergent close-coupling approach to positron scattering on He^+★

Curtin Institute for Computation and Department of Physics, Astronomy and Medical Radiation Sciences, Curtin University, GPO Box U1987, Perth, WA 6845, Australia

^a e-mail: charlie.rawlins@postgrad.curtin.edu.au

Received: 27 August 2017
Received in final form: 16 January 2018
Published online: 30 April 2018

Abstract

A close-coupling method is used to generate electron-loss and total scattering cross sections for the first three partial waves with both a single-centre and two-centre expansion of the scattering wave function for positron scattering on He⁺. The two expansions are consistent with each other above the ionisation threshold verifying newly-developed positronium-formation matrix elements. Below the positronium-formation threshold both the single- and two-centre results agree with the elastic-scattering cross sections generated from the phase shifts reported in previous calculations.