The ejected-electron spectrum of calcium vapour between 12.8 and 28.1 eV has been observed at 75 degrees with respect to an incident electron beam of 30 to 500 eV energy. A total of 165 lines are reported, corresponding to excitation of both Ca I and Ca II levels. The results are compared with photoabsorption measurements and high-energy electron impact data.
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Pejčev et al. (1978) studied this question.
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