Doubly differential cross sections for K-shell ionization by electron and positron impact

Abstract

We have investigated the universal scaling behavior of differential cross sections for the single K-shell ionization by electron or positron impact. The study is performed within the framework of non-relativistic perturbation theory, taking into account the one-photon exchange diagrams. In the case of low-energy positron scattering, the doubly differential cross section exhibits prominent interference oscillations. The results obtained are valid for arbitrary atomic targets with moderate values of nuclear charge number Z.

Scaling behaviour of positronium formation cross sections for positron scattering from hydrogen-like ions

“…Scaling laws are of great interest in many fields of physics, for instance, the ionization and charge transfer processes of atoms by electron or positron impact [1][2][3][4][5], excitation and ionization of ions by proton or antiproton impact [6][7][8] and various elementary processes in plasma physics [9]. Because hydrogen-like (H-like) isoelectronic ions are the simplest atomic systems without multi-electron interactions, the positronium (Ps) formation of H-like ions by positron impact offers a special opportunity to study the scaling behaviour of the charge transfer collisions.…”