# RMATRX-ION — A program to calculate electron and positron impact ionization within the R-matrix method

## Description

Abstract An extension of the standard non-relativistic R-matrix codes is presented which allows for the calculation of total and single differential (with regard to energy loss) electron and positron impact ionization cross sections of atoms and ions. The method uses distorted waves for a “fast” ionizing projectile and an R-matrix (close-coupling) expansion for the “slow” ejected electron. Exchange between outgoing electrons (for electron impact ionization) and positronium formation (for positron impa... Title of program: RMATRX-ION Catalogue Id: ACLN_v1_0 Nature of problem This program can be used to calculate the single differential (with regard to energy loss) and total (i.e., integrated over all energy losses) cross sections for impact ionization of atoms and ions by electrons and positrons. Versions of this program held in the CPC repository in Mendeley Data ACLN_v1_0; RMATRX-ION; 10.1016/0010-4655(93)90176-D This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)