Excitation cross sections and polarization of impact radiation in Li/Na-He/Ne high energy collisions

Cross sections and polarizations of impact radiation have been calculated for 2s → 2p excitation of Li in collisions with He and Ne, and for 3s → 3p excitation of Na in collisions with He and Ne, for the (center of mass) energy ranges Esub(CM)=0.2-100 keV (Li/Na-He), Esub(CM)=0.7-100 keV (Li-Ne) and Esub(CM)=1-100 keV (Na-Ne). Each alkali-rare gas pair has been treated as a quasi-one-electron system consisting of the valence electron of the alkali atom and the two closed shell cores of the alkali ion and the rare gas atom. The interactions have been represented by a number of semi-empirical model potentials. Close-coupling solutions to the impact-parameter equations have been obtained assuming a rectilinear trajectory for the relative motion of the two cores. The calculations have been based on 3-state one-center expansions of the electronic states, 2s, 2p0 and 2psub(+-1) in the case of Li-He/Ne collisions, and 3s, 3p0 and 3psub(+-1) in the case of Na-He/Ne collisions. For Li-He/Ne collisions a study of excitation cross sections and of polarizations of emissions calculated for two Baylis model potentials, two Bottcher-type model potentials and a single Hartree-Fock frozen-core potential are presented. For Na-He/Ne collisions the results obtained by the Baylis model potential are given. (Auth.)