Single electron transfer and target excitation in He2+ + Na (3s) collisions at 2-50 keV amu-1 in the coupled-Sturmian-pseudostate approach

A two-centre coupled-Sturmian-pseudostate approach is employed to calculate single electron transfer, target excitation and total ionization cross sections for the He2+ + Na (3s) collision system at 2-50 keV amu-1 impact energies. The Sturmian basis set, together with an analytic Hartree-Fock potential for the Na core, are chosen carefully so that all three channels (transfer, excitation and ionization) are included in the coupled scheme. The present state-selective and total charge transfer cross sections compare fairly well with experimental data, as well as with previous theoretical results, particularly below 10 keV amu-1. The target excitation cross sections for the sodium 3p and 4d states are in very good agreement with the available measurements, while significant discrepancy exists between theory and experiment for the excitation of the Na (4p) state. (author)