Effect of Absorption and Polarization Potentials in The Distorted Wave Calculation of Positron Impact Excitation of Autoionizing State of Rubidium

Abstract

This study focuses on the scattering of positrons and rubidium atoms. We utilized the distorted wave approach to compute the cross sections and alignment parameter from near excitation threshold up to 1500 eV. Our system employed Clementi and Roetti (1974) multi-zeta Roothan-Hatree-Fock wave. We employed a complex distortion potential comprising static, absorption, and polarization terms to calculate cross sections and the alignment parameter. Our results were compared with other available studies, and we found that including polarization and absorption potentials significantly affected the cross-sections and the alignment parameter, especially at low-impact energies. These two potentials enhanced the accuracy of both the cross-section and alignment parameter results.