# Betrt-a procedure to evaluate the cross section for electron-hydrogen collisions in the bethe approximation to the reactance matrix

## Description

Title of program: BETRT Catalogue Id: AAXK_v1_0 Nature of problem The calculation of cross sections for electron impact excitation of neutrals in the intermediate energy range is greatly complicated by the large number of partial waves which contribute. It has been argued that the unitarised Born approximation gives an adequate representation of all but the partial cross sections corresponding to the smallest values of L, the total angular momentum. Further for L large the Born Reactance matrix may be approximated to a high degree of accuracy by the Bethe. The ... Versions of this program held in the CPC repository in Mendeley Data AAXK_v1_0; BETRT; 10.1016/0010-4655(87)90115-9 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)