The electron impact excitation of Ca + from the ground state to four terms of the autoionising configurations 3p 5 3d4s and 3p 5 4s 2 is calculated using the R-matrix method. Close to threshold electron capture ionisation is found to be important. Good agreement is obtained with the ionisation measurements of Peart and Dolder (1975) over a wide energy range.
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Burke et al. (1983) studied this question.
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