4.6 Article

Line-shape broadening of an autoionizing state in helium at high XUV intensity

期刊

NEW JOURNAL OF PHYSICS
卷 24, 期 1, 页码 -

出版社

IOP Publishing Ltd
DOI: 10.1088/1367-2630/ac3b2e

关键词

FEL; SASE; strong coupling; autoionization; line-width broadening; transient-absorption spectroscopy; helium

资金

  1. Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy [EXC 2181/1 - 390900948]
  2. European Research Council (ERC) [X-MuSiC-616783]

向作者/读者索取更多资源

We investigate the interaction between intense extreme ultraviolet (XUV) light and the 2s2p doubly excited state in helium. Experimental results show that high XUV intensities can modify the line-width of the 2s2p state. Simulation results reveal that this line-width broadening is connected to the strong coupling between the ground state and the 2s2p doubly excited state.
We study the interaction of intense extreme ultraviolet (XUV) light with the 2s2p doubly excited state in helium. In addition to previously understood energy-level and phase shifts, high XUV intensities may lead to other absorption-line-shape distortions. Here, we report on experimental transient-absorption spectroscopy results on the 2s2p line-width modification in helium in intense stochastic XUV fields. A few-level-model simulation is realized to investigate the origins of this effect. We find that the line-shape broadening is connected to the strong coupling of the ground state to the 2s2p doubly excited state which is embedded in the ionization continuum. As the broadening takes place for intensities lower than for other strong-coupling processes, e.g. observed asymmetry changes of the absorption profile, this signature can be identified already in an intermediate intensity regime. These findings are in general relevant for resonant inner-shell transitions in nonlinear experiments with XUV and x-ray photon energies at high intensity.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据