Electron scattering by atomic sodium: 32S - 32S and 32S - 32P cross sections at 10-100 eV

A coupled-channel optical method for electron-atom scattering is applied to electron-sodium scattering at energies of 10, 20, 22.1, 40, 54.4, and 100 eV. The 32S, 32P, and 32D channels are coupled explicitly whereas the rest of the one-electron excited states of the atom are taken into account via the 'ab initio' complex non-local polarization potential. The S2S-32S and 32S-32P differential cross sections are found to be in good agreement with the recent experiments. The effect of the polarization potential does not change the qualitative results of a standard coupled-channel calculation, but improves agreement with the experiment. Integrated and total cross sections are also presented. 18 refs., 3 tabs., 2 figs