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
收藏
页码：726 / 732
页数：7
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