Electron and positron impact single ionization TDCS of argon atoms in the second Born approximation

Abstract

We present triple-differential cross section results for the positron and electron induced single ionization of the Ar (3p) and Ar (3s) atoms at incident energy 1 keV. The triple-differential cross sections (TDCSs) have been calculated in the modified distorted wave formalism using the second Born approximation. The TDCSs have been calculated in coplanar asymmetric geometry for different kinematical conditions. The second Born term has been found to be significant in obtaining the TDCS for electron as well as positron impact at smaller values of momentum transfer and it produces better agreement with the recent available measurements for Ar (3p). With the increase of momentum transfer, the dominance of binary emission of electrons has been found to increase for the positron impact ionization of Ar (3s).