Triply differential cross sections for electron and positron impact on methane

Prithvi Singh; Vijay Bagul; Christophe Champion

doi:10.1063/5.0149844

Triply differential cross sections for electron and positron impact on methane

J Chem Phys. 2023 Jul 28;159(4):044302. doi: 10.1063/5.0149844.

Authors

Prithvi Singh¹, Vijay Bagul¹, Christophe Champion²

Affiliations

¹ Department of Physics, School of Engineering, Sir Padampat Singhania University, Bhatewar, Udaipur, Rajasthan 313601, India.
² Centre d'Études Lasers et Applications (CELIA), Université de Bordeaux, 33400 Talence, France.

PMID: 37486430
DOI: 10.1063/5.0149844

Abstract

We here report theoretical triply differential cross sections (TDCS) for 250 eV electron and positron impact ionization of the methane molecule calculated within the second-order distorted-wave Born approximation (DWBA2) for various momentum transfer conditions. The experimental data taken from Işık et al. [J. Phys. B: At., Mol. Opt. Phys. 49, 065203 (2016)] will be compared with the current theoretical predictions as well as molecular three body distorted wave (M3DW) approximation and generalized Sturmian function (GSF) theoretical models in a non-coplanar geometry. In the low analyzer scattering plane, the results obtained within the DWBA2 theory show better agreement with the experimental results compared to the GSF results. The M3DW results also exhibit agreement with the experimental results, in particular in the perpendicular plane geometry. Furthermore, significant differences between electron and positron TDCS were observed.