Journal article

Publication year: 2000

Pages: L553-L562

Journal: Journal of Physics B: Atomic, Molecular and Optical Physics

Volume number: 33

Issue number: 15

ISSN: 0953-4075

DOI Link: https://doi.org/10.1088/0953-4075/33/15/107

Publisher: IOP Publishing

Abstract: 
The cross section for electron-impact ionization of Al2+ in the energy range 60-100 eV has been calculated using a unified R-matrix method which describes both direct and indirect processes in a consistent manner. The direct 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 and thirty-two autoionizing states in the R-matrix expansion, completely convergent results for the total cross section have been obtained. The calculated total cross sections are in very good agreement 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. Mel. Opt. Phys. 31 911). In particular, the present calculation predicts the existence of resonances due to READI process and reproduces very well the experimental non-resonant and resonant features observed by Thomason and Pearl. The remaining discrepancy between theory and experiment is discussed.

Harvard Citation style: Teng, H. (2000) Electron-impact ionization of Al²⁺ ions:: a unified R-matrix calculation, Journal of Physics B: Atomic, Molecular and Optical Physics, 33(15), pp. L553-L562. https://doi.org/10.1088/0953-4075/33/15/107

APA Citation style: Teng, H. (2000). Electron-impact ionization of Al²⁺ ions:: a unified R-matrix calculation. Journal of Physics B: Atomic, Molecular and Optical Physics. 33(15), L553-L562. https://doi.org/10.1088/0953-4075/33/15/107