Excitation of Li and Na in collisions with He and Ne: measurements of Li I and Na I resonance-line emission and polarization

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Abstract
Total emission cross sections and polarizations have been measured for the 22S-22P, 22P-32D and 22P-32S Li I multiplets in Li-He, Ne collisions, and the 32S-32P and 32P-32D Na I multiplets in Na-He, Ne collisions in the 0.6-60 keV energy range. The excitation of the alkali resonance multiplet is found to be the dominant inelastic process for all four collision systems. The results are compared with recent calculations by Manique et al. (1977) based on a quasi-one-electron description using various model potentials. Good agreement is found for Li-He with a simple Hartree-Fock frozen-core potential. The agreement is fair for Li, Na-He calculations with a Baylis-type potential but poor for calculations based on Bottcher-model potentials. For Ne as target all three potentials overestimate by far the size of the cross section.