Abstract
The cross section for electron-impact ionization of Al2+ in the energy range 60-100 eV hasbeen calculated using a unifiedR-matrix method which describes both direct and indirectprocesses in a consistent manner. Thedirect ionization (DI),excitation autoionization (EA),resonant excitation double-autoionization (REDA) and resonant excitation auto-double-ionization (READI) processes are included in the present work. By including seven bound target states, five pseudo states andthirty-two autoionizing states in the R-matrix expansion, completelyconvergent results for the total cross section have been obtained.The calculated total cross sections are in very goodagreement with the recent experimental results of Thomason and Peart (1998 J. Phys. B: At. Mol. Opt. Phys. 31 L201) and the pseudo state R-matrix calculation of Badnell et al (1998 J. Phys. B: At. Mol. Opt. Phys. 31 911).In particular, the present calculation predicts the existence ofresonances due to READIprocess and reproduces very well the experimental non-resonant and resonantfeatures observed by Thomason and Peart. The remainingdiscrepancy between theory and experiment is discussed.
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