Normalized single-shot X-ray absorption spectroscopy at a free-electron laser
Normalized single-shot X-ray absorption spectroscopy at a free-electron laser
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DOI：
10.1364/ol.44.002157
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发表时间：
2019-05-01
期刊：
影响因子：
3.6
通讯作者：
Beye, Martin
中科院分区：
文献类型：
--
作者：
Brenner, Guenter;Dziarzhytski, Siarhei;Beye, Martin
色散X射线吸收光谱（XAS）的设置，采用一种新的参考方案，已实施和测试的软X射线自由电子激光（FEL）FLASH在汉堡。使用透射光栅将自由电子激光束分成两个副本（信号和参考）。同时测量两个光束的光谱内容，以在自由电子激光带宽内逐次进行强度归一化。在143 eV光子能量下，两束光之间的良好相关性在几个百分点内被证明是单聚束操作。应用归一化方案，Gd 2 O3薄膜样品的吸收光谱被记录在Gd N-4，N-5边缘光子能量为143 eV附近，显示出与在同步加速器处测量的参考光谱的极好的一致性。该方案为在自由电子激光器上实现具有飞秒时间分辨率的时间分辨单次XAS打开了大门。(C)2019美国光学学会
A setup for dispersive X-ray absorption spectroscopy (XAS), employing a new reference scheme, has been implemented and tested at the soft X-ray free-electron laser (FEL) FLASH in Hamburg. A transmission grating was used to split the FEL beam into two copies (signal and reference). The spectral content of both beams was simultaneously measured for intensity normalization within the FEL bandwidth on a shot-to-shot basis. Excellent correlation between the two beams was demonstrated within a few percent for single bunch operation at 143 eV photon energy. Applying the normalization scheme, an absorption spectrum of a Gd2O3 thin film sample was recorded around the Gd N-4,N-5-edge photon energy of 143 eV, showing excellent agreement with a reference spectrum measured at a synchrotron. This scheme opens the door for time-resolved single-shot XAS with femtosecond time resolution at FELs. (C) 2019 Optical Society of America