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

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