Autoionizing resonances in electron-impact ionization of O5+ ions -: art. no. 062720

被引:0
作者
Müller, A
Teng, H
Hofmann, G
Phaneuf, RA
Salzborn, E
机构
[1] Univ Giessen, Inst Kernphys, D-35392 Giessen, Germany
[2] Univ Nevada, Dept Phys, Reno, NV 89557 USA
来源
PHYSICAL REVIEW A | 2000年 / 62卷 / 06期
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中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
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)].
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