Electron and positron scattering from halogenated methanes: a comparison of elastic cross sections

This paper discusses the use of quantum scattering methods for the evaluati on of the elastic (rotationally summed) integral and differential cross sec tions produced in collisions at low energies (E-coll less than or equal to 20 eV) of electrons and positrons with polyatomic gaseous targets. The calc ulations use close-coupled equations and a parameter-free model of electron and positron interactions with the molecules in a single-collision situati on. Comparison with existing experiments on the collision processes with th e two projectiles helps us to know more detail about the features of the fo rces in play during the scattering events. Computed results are also found to be in good accord with experiments.