Abstract
Ionization cross sections for electron impact are measured with crossed electron and atom beams. Total numbers of particles are determined by the light emission of excited atoms. Absolute ionization cross sections may be obtained by using absolute excitation cross sections. If these are not known, they may be measured in the same apparatus. Putting aside the absolute value of the excitation cross sections, the ionization cross section can be obtained in the latter case without calibration of the photo-multiplier. Preliminary results for Ca are in good agreement with calculations by Lotz (1968).
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