The ionisation of Ca2+by energy-resolved electrons

This is the authors' abstract. We don't add key points for this paper.

Cross sections for the ionisation of Ca 2+ by energy-resolved electrons have been measured for electron energies between 21 and 50 eV. Considerable structure was resolved in the ionisation function. At energies where autoionisation is dominant, the cross sections differ substantially from the results of recent calculations by Burke et al. (1983), Griffin et al. (1984) and Pindzola et al. (1987). The experiment indicates that many more transitions are significant than have so far been included in theory. Comparisons are also made with energies of autoionising levels deduced from theory, from ejected-electron spectra of neutral calcium and from the photoionisation of Ca 2+ .