The principal mechanism of cadmium ionization of a positive-column helium-cadmium laser discharge has been determined. Use has been made of the dip in the radial profiles of metal-ion states which results from the high metal ionization rate in such a discharge. The constancy of the dip with changing cadmium partial pressure indicates that helium ions and metastable atoms are of secondary importance in ionizing the cadmium, and that electrons are the primary source of metal ionization. A more detailed examination over widely differing discharge conditions supports this conclusion.
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A L McKenzie (1977) studied this question.
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