X-ray signature of charge exchange in the spectra of L-shell iron ions

被引：14

作者：

Beiersdorfer, P. ^{[1
,2
]}

Schweikhard, L. ^{[3
]}

Liebisch, P. ^{[2
]}

Brown, G. V. ^{[2
]}

机构：

[1] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA USA

[2] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[3] Emst Moritz Amdt Univ, Inst Phys, D-17487 Greifswald, Germany

来源：

ASTROPHYSICAL JOURNAL | 2008年 / 672卷 / 01期

关键词：

atomic data; atomic processes; line : formation; X-rays : general;

D O I：

10.1086/522617

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The X-ray signature of charge exchange between highly charged L-shell iron ions and neutral gas atoms was studied in the laboratory in order to assess its diagnostic utility. Significant differences with spectra formed by electron-impact excitation were observed. In particular, a strong enhancement was found of the emission corresponding to n >= 4 -> n = 2 transitions relative to the n = 3 -> n = 2 emission. This enhancement was detectable even with relatively low-resolution X-ray instrumentation (E/Delta E approximate to 10) and may enable future identification of charge exchange as a line-formation mechanism in astrophysical spectra.

引用

页码：726 / 732

页数：7

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