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Electron-impact ionization cross sections for Fe"+ have been calculated using relativistic distortedwave methods. We have performed the most comprehensive calculation to date by including more than 10000 autoionizing levels for resonant-excitation double-autoionization (REDA) processes. The total cross sections exhibit many strong narrow resonances. The REDA process contributes about 30% to the average total cross sections. General good agreement between theory and experiment is attained, but new experimental investigations are needed to search for the predicted resonances.

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