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Low-energy behaviour of e–O scattering calculations

We report on calculations of low-energy e–O scattering using the R-matrix method. We compare cross sections for elastic scattering and excitation with experiment and recent theoretical values. We calculate elastic cross sections for the 3Pe ground state and cross sections for excitation to and between the 1De and 1Se states. We present detailed comparisons of elastic differential cross sections with experiment. We compare our approach using orthogonal orbitals with an approach using non-orthogonal orbitals. We investigate noticeable differences in results from different calculations towards the low-energy limit. We discuss the use of long-range polarization pseudostates and issues of convergence of results for an open-shell neutral atom for which exact target states are not available.