Journal article

Publication year: 2000

Journal: Physical review A

Volume number: 62

Issue number: 6

ISSN: 1050-2947

eISSN: 1094-1622

Publisher: American Physical Society

Abstract: 
We report on a detailed experimental and theoretical study of electron-impact ionization of O5+ ions. A high-resolution scan measurement of the K-shell excitation threshold region has been performed with statistical uncertainties as low as 0.03%. At this level of precision a wealth of features in the cross section arising from indirect ionization processes becomes visible, and even interference of direct ionization with resonant-excitation/auto-double-ionization (READI) is clearly observed. The experimental results are compared with R-matrix calculations that include both direct and indirect processes in a unified way. Radiative damping of autoionizing Li-like states is found to be about 10-15 %. The calculations almost perfectly reproduce most of the experimental resonance features found in the present measurement including READI. They also agree with the direct-ionization converged close-coupling results of I. Bray [J. Phys. B 28, L247 (1995)] and the absolute total ionization cross section measurement of K. Rinn et al. [Phys. Rev. A 36, 595 (1987)].

Harvard Citation style: Müller, A., Teng, H., Hofmann, G., Phaneuf, R. and Salzborn, E. (2000) Autoionizing resonances in electron-impact ionization of O⁵⁺ ions -: art. no. 062720, PHYSICAL REVIEW A, 62(6), Article 062720

APA Citation style: Müller, A., Teng, H., Hofmann, G., Phaneuf, R., & Salzborn, E. (2000). Autoionizing resonances in electron-impact ionization of O⁵⁺ ions -: art. no. 062720. PHYSICAL REVIEW A. 62(6), Article 062720.