Abstract

Differential excitation cross sections for the transitions from 1 $^{1}\mathrm{S}$ to 2${\mathrm{}}^{3}$S, 2${\mathrm{}}^{1}$S, 2${\mathrm{}}^{3}$P, and 2${\mathrm{}}^{1}$P in He-like ${\mathrm{Li}}^{+}$ are calculated in the distorted-wave and close-coupling approximations in order to study their sensitivity to continuum coupling effects. Comparisons are made between nonunitarized distorted-wave, 5-state unitarized distorted-wave, 5-state close-coupling, and 11-state close-coupling calculations. The results indicate that the shape of the cross sections, as a function of scattering angle, can be significantly different for the various levels of approximation, even when the total cross sections are in reasonably close agreement.

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