Elastic scattering of low-energy electrons by OCS molecules.

Abstract

We report results from an ab initio calculation of low-energy electron scattering by OCS molecules. We used the Schwinger multichannel method with pseudopotentials at the fixed-nuclei static-exchange approximation to calculate elastic integral, differential and momentum transfer cross sections in the energy range from 5 to 50 eV. We compare our results with available theoretical results and experimental data. Through the symmetry decomposition of our integral cross section and eigenphase sum analysis, we found structures in the cross sections that may be interpreted as shape resonances for ∑, ∏ and Δ symmetries. We compared the results for OCS with our previous results on the e^––CS₂ collision. In particular, we found a similar behaviour in the shape of the symmetry decomposed cross sections of OCS and of CS₂ when, for the latter, we sum over the ‘g’ and ‘u’ contributions.