Electron-impact ionization of Se/sup 24+/
1989
Cross sections for electron-impact ionization of neonlike selenium have been calculated using close-coupling wave functions. We report cross sections for ionization of the 2s/sup 2/2p/sup 6/ /sup 1/S ground state and the 2s/sup 2/2p/sup 5/3s /sup 3/P excited state of the ion. We found numerous resonances in the ejected electron channels due to excitation of 2s/sup 2/2p/sup 4/3snl autoionizing states. The resonances are very narrow, but some have peaks that are several orders of magnitude above the nonresonant background cross section. Even with radiative decay taken into account, the resonances enhance the total integrated cross section by nearly a factor of 4.
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