# Impact, a program for the solution of the coupled integro-differential equations of electron-atom collision theory

## Description

Title of program: IMPACT Catalogue Id: ACYE_v1_0 Nature of problem It is required to obtain approximate solutions of the Schroedinger equation (H-E)Psi=0 where Psi is the wave function for a system containing (M+1)-electrons and a nucleus of charge z. Using a variational principle, one obtains a system of coupled integro- differential (ID) equations for the radial functions F(r) and coefficients c. IMPACT is a computer program for the solution of these equations. Put E = ELOW + EKLSQ where ELOW is the energy for the ground state of the M electron system and EKL ... Versions of this program held in the CPC repository in Mendeley Data ACYE_v1_0; IMPACT; 10.1016/0010-4655(78)90082-6 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)