Eur. Phys. J. D 45, 253-259 (2007)
https://doi.org/10.1140/epjd/e2007-00235-1

Geometric shielding corrections for total cross section calculations of electron scattering by CH₄, C₂H₆, C₂H₃F₃, C₂H₄, C₂F₄, C₂Cl₄ and C₂Cl₂F₂ from 30–5000 eV

¹ Department of Physics, Henan Normal University, Xinxiang, 453007, P.R. China
² Department of Physics, Luoyang Normal University, Luoyang, 471022, P.R. China

Corresponding author: ^a scattering@sina.com.cn

Received: 2 December 2006
Revised: 29 January 2007
Published online: 18 July 2007

Abstract

To quantify the changes in the geometric shielding effect in a molecule as the incident electron energy varies, an empirical fraction, which represents the total cross section contributions of shielded atoms in a molecule at different energies, is presented. Using this empirical fraction, the total cross sections for electron scattering by CH₄, C₂H₆, C₂H₃F₃, C₂H₄, C₂F₄, C₂Cl₄ and C₂Cl₂F₂ are calculated over a wide energy range from 30 to 5000 eV by the additivity rule model at the Hartree-Fock level. The quantitative total cross sections are compared with those obtained by experiment and other theories where available. Good agreement is attained above 100 eV.