Regular Article

Elastic electron differential cross sections for argon atom in the intermediate energy range from 40 eV to 300 eV^☆,☆☆

¹ Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia
² Institute for Nuclear Research, Hungarian Academy of Sciences (ATOMKI), Debrecen, Hungary
³ ELI-ALPS, ELI-HU Non-profit Kft., Szeged, Hungary

^a e-mail: bratislav.marinkovic@ipb.ac.rs

Received: 25 October 2017
Received in final form: 29 November 2017
Published online: 6 February 2018

Abstract

Measurements and calculations for electron elastic differential cross sections (DCS) of argon atom in the energy range from 40 to 300 eV are presented. DCS have been measured in the crossed beam arrangement of the electron spectrometer with an energy resolution of 0.5 eV and angular resolution of 1.5^∘ in the range of scattering angles from 20^∘ to 126^∘. Both angular behaviour and energy dependence of DCS are obtained in a separate sets of experiments, while the absolute scale is achieved via relative flow method, using helium as a reference gas. All data is corrected for the energy transmission function, changes of primary electron beam current and target pressure, and effective path length (volume correction). DCSs are calculated in relativistic framework by expressing the Mott’s cross sections in partial wave expansion. Our results are compared with other available data.