Abstract
Cross sections have been measured for the ionization of Rb+, Cs+, Ca+ and Sr+ ions by electron impact. In the cases of Rb+ and Cs+ the shapes of the ionization functions displayed irregularities which were attributed to the direct ejection of inner-shell electrons. By contrast, the ionization functions of Ca+ and Sr+ exhibited very large and abrupt rises centred at 27 and 26 eV, respectively. These were attributed to the onset of autoionization which, for a wide range of electron energies, was the dominant mode of ionization. An interpretation of the measurements is presented which is based on the results of recent calculations by Hansen (1974).
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