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Absolute cross sections for the single ionization of Al + and Cd + by energy-resolved electrons have been measured from their thresholds to 115 eV and 95 eV respectively. The Al + cross section was similar in magnitude to those reported by Montague and Harrison (1983) and Belie et al (1987) but differed in detail. Contributions from excitation-autoionization and the states that may give rise to it are discussed. The Cd + cross section was similar to that of Belie et al except that considerable step-like structure due to indirect ionization processes was resolved for electron energies above 20 eV.
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Hayton et al. (1994) studied this question.
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