Abstract
The relative ionization probabilities of copper, silver, and gold by electron impact have been studied near threshold. Nearly monoenergetic electrons, obtained by means of the retarding potential difference method, were employed. Narrow peaks were found superimposed on the ion yield that arises from transition to the ion ground state. It was possible to correlate these peaks with groups of energy levels, many of which are known to autoionize. The ionization probability curve for formation of doubly ionized gold was also obtained and found to be a sum of linear functions of the electron excess energy. The onset of each linear section indicated the presence of an excited state of Au III. Three energy levels were located at 2.26, 3.92, and 7.81 ev above the ground state.
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