Positron scattering from carbon dioxide

Abstract

We report total cross section measurements for positron scattering from carbon dioxide $({\mathrm{CO}}_{2})$. The energy range of the present measurements is $0.1--20.0\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$. The present study is undertaken to both try and resolve a discrepancy in the literature between the earlier low-energy works of Hoffman et al. [Phys. Rev. A 25, 1393 (1982)] and Kimura et al. [J. Chem. Phys. 107, 6616 (1997)], and to extend the available data to lower energies. We find generally good agreement with the data of Hoffman et al. over the common experimental energy range. A comparison of the present data with available calculations is also made, as is a comparison with corresponding electron total cross section data.