Polarization measurements of the Lyman-{alpha}{sub 1} x-ray emission lines of hydrogenlike Ar{sup 17+} and Fe{sup 25+} at high electron-impact energies
Polarization measurements of the Lyman-{alpha}{sub 1} x-ray emission lines of hydrogenlike Ar{sup 17+} and Fe{sup 25+} at high electron-impact energies
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DOI：
10.1103/physreva.74.022713
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发表时间：
2006-08
影响因子：
2.9
通讯作者：
D. L. Robbins;P. Beiersdorfer;A. Faenov;T. Pikuz;D. Thorn;Hui-Hwa Chen;K. Reed;A. Smith;K. Boyce;G. Brown;R. Kelley;C. Kilbourne;F. Porter
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文献类型：
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作者：
D. L. Robbins;P. Beiersdorfer;A. Faenov;T. Pikuz;D. Thorn;Hui-Hwa Chen;K. Reed;A. Smith;K. Boyce;G. Brown;R. Kelley;C. Kilbourne;F. Porter
我们测量了类氢Ar{sup 17+}和Fe{sup 25+}的2p{sub3/2}{殖利率}1s{sub1/2}Lyman-{α}{sub1}X射线谱线在7到25个阈值单位的偏振。利用劳伦斯·利弗莫尔国家实验室SuperEBIT电子束离子陷阱产生了高电荷态的Ar和Fe离子。用两个晶体能谱仪和一个微量热计相结合的方法记录了Ar{sup 17+}和Fe{sup 25+}的Lyman-αX射线发射，并推测了Lyman-α{sub1}谱线的偏振。我们的结果与扭曲波计算的预测有系统的差异。
We have measured the polarization of the 2p{sub 3/2}{yields}1s{sub 1/2} Lyman-{alpha}{sub 1} x-ray line of hydrogenlike Ar{sup 17+} and Fe{sup 25+} at electron-impact energies ranging from 7 to 25 threshold units. The highly charged argon and iron ions were produced using the Lawrence Livermore National Laboratory SuperEBIT electron beam ion trap. A combination of two crystal spectrometers and a microcalorimeter were used to record the Lyman-{alpha} x-ray emission of Ar{sup 17+} and Fe{sup 25+} and to infer the polarization of the Lyman-{alpha}{sub 1} line. Our results show a systematic discrepancy with the predictions of distorted-wave calculations.