Elastic scattering of low-energy electrons by OCS molecules

We report results from an ab initio calculation of low-energy electron scat tering by OCS molecules. We used the Schwinger multichannel method with pse udopotentials at the fixed-nuclei static-exchange approximation to calculat e elastic integral, differential and momentum transfer cross sections in th e energy range from 5 to 50 eV. We compare our results with available theor etical results and experimental data. Through the symmetry decomposition of our integral cross section and eigenphase sum analysis, we found structure s in the cross sections that may be interpreted as shape resonances for Sig ma, Pi and Delta symmetries. We compared the results for OCS with our previ ous results on the e(-)-CS2 collision. In particular, we found a similar be haviour in the shape of the symmetry decomposed cross sections of OCS and o f CS2 when, for the latter, we sum over the 'g' and 'u' contributions.