Subroutines for the evaluation of cross sections of one-photon radiative processes occuring in fast-electron H-atom collisions

Published: 1 January 1990| Version 1 | DOI: 10.17632/gxpvxwj8s4.1
Alain Dubois, Alfred Maquet


Abstract We propose two distinct fast routines to evaluate the cross sections of the one-photon processes occuring in the course of fast electron-hydrogen atom collisions: free-free transitions observed in the presence of an external laser source and bremsstrahlung. In spite of the presence of the Coulomb Green's function, a very compact and numerically convenient expression of the related amplitude has been derived so that the computations can be performed on a microcomputer. Title of program: BREMSS Catalogue Id: ABTF_v1_0 Nature of problem During a collision event, the coupling of the electron-atom system with the empty modes of the electromagnetic field can lead to the spontaneous emission of bremsstrahlung radiation. The related transistion amplitude is, apart from a multiplicative factor, identical to the free-free transition one. Using the very compact form of this latter, the present routine evaluates the twofold differential bremsstrahlung cross section, i.e. the integration of the transition amplitude over all propagation d ... Versions of this program held in the CPC repository in Mendeley Data ABTF_v1_0; BREMSS; 10.1016/0010-4655(90)90014-R This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2019)



Atomic Physics, Computational Physics