# A general program to calculate atomic continuum processes using the NIEM method

## Description

Abstract This paper describes a set of computer program packages NIEM which enable electron-atom and electron-ion collision cross sections to be calculated for a general atomic system described by LS-coupling. The calculations are based on a non-iterative integral equation method. Title of program: NIEM NIES2 Catalogue Id: AAJH_v1_0 Nature of problem This program reads the direct potentials, the coefficients in the asymptotic expansion of the potentials, exchange coefficients, and correlation potentials stored on a permanent tape or disc file by NIEM POTC1. It solves the set of integro-differential equations by a non- iterative integral equation method from the origin to a radial boundary R1STOP. The program calls GRN2 which calculates the regular and irregular Green's function for the problem. Versions of this program held in the CPC repository in Mendeley Data AAJH_v1_0; NIEM NIES2; 10.1016/0010-4655(81)90002-3 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)