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With the aid of analytic wave functions determined by tho variationai method, the quantum mechanical cross-sections for the excitation of the valence electron, an electron in an inner closed ehell, and of the simultaneoüs excitation and ionization have been calculated analytically for the lithium atom. 1t is found that the probability of excitation of.an electron in a closed shell is in general very small compared with those for the excitation of the valence eleetron, but is of the same order of magnitude as those for the Bimultaneous excitation and ionization. The experiments of Lee on electron collision and the observation of Edlen: and Tyren on the satellite lines in atomic spectra arc briøfly discussed on the baeis of these calculationg.

Probabilites of Ionization and Excitation of Closed Sbell Electron of Li by Electon Impact