Energy and angular distributions in 250 eV electron and positron collisions with argon atom

Abstract

2 1 K. Tőkési1, and R. D. DuBois2Institute for Nuclear Research (ATOMKI), Hungary, EUMissouri University of Science and Technology, Rolla MO 65409 USAWe present energy and angular differential cross sections for single-ionization in collisionsbetween electrons and positrons with argon atoms at 250 eV. We treat the collision classicallyusing the three body approximation where the target atoms are described within the single activeelectron approximation using a Garvey model potential and only the outermost electron isinvolved in the collision dynamics. Our present CTMC model is shown to describe theionization cross sections reasonably well and agree with existing experimental data. We presentalso the ionization probabilities as a function of impact parameter. We found that for the caseof positron impact the distribution is symmetric, while for the case of electron impact thedistribution is asymmetric.keywords: Classical trajectory Monte Carlo model, ionization, electron impact