Ionization Probability Curves Near Threshold for Zn, Cd, and Hg

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Abstract
The ionization probability curves near threshold of the closely related elements zinc, cadmium, and mercury have been obtained using nearly monoenergetic electrons. Structure observed in the curves is interpreted as the result of autoionization of states of the atom which arise from the excitation of a single inner shell electron. In the analysis of the results, it is necessary to consider both the optically allowed and forbidden excited states. The energy levels of the optically allowed states of this system have been identified by Beutler, but the locations of the optically forbidden states are unknown.