Femtosecond x-ray absorption spectroscopy with hard x-ray free electron laser
Femtosecond x-ray absorption spectroscopy with hard x-ray free electron laser
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DOI：
10.1063/1.4821108
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发表时间：
2013-09-23
影响因子：
4
通讯作者：
Yabashi, Makina
中科院分区：
文献类型：
--
作者：
Katayama, Tetsuo;Inubushi, Yuichi;Yabashi, Makina
我们开发了一种利用自放大自发发射 (SASE) 机制产生的硬 X 射线自由电子激光器 (XFEL) 进行色散 X 射线吸收光谱的方法。利用传输光栅将具有相对较大带宽（Delta E/E 类似于 5 x 10(-3)）的 SASE-XFEL 光分成多个分支。将两个主分裂光束引入色散光谱仪中，用于同时测量信号和参考光谱。归一化后，我们获得了光子能量范围为210 eV的Zn K边吸收光谱，这与传统波长扫描方法测量的结果非常吻合。通过对差异光谱的分析，噪声比被评估为类似于 3 x 10(-3)，该值足够小，足以追踪超快光学激光器引起的瞬态光谱的微小变化。该方案使我们能够执行具有飞秒时间分辨率的单次、高精度 X 射线吸收光谱。 (C) 2013 AIP 出版有限责任公司。
We have developed a method of dispersive x-ray absorption spectroscopy with a hard x-ray free electron laser (XFEL), generated by a self-amplified spontaneous emission (SASE) mechanism. A transmission grating was utilized for splitting SASE-XFEL light, which has a relatively large bandwidth (Delta E/E similar to 5 x 10(-3)), into several branches. Two primary split beams were introduced into a dispersive spectrometer for measuring signal and reference spectra simultaneously. After normalization, we obtained a Zn K-edge absorption spectrum with a photon-energy range of 210 eV, which is in excellent agreement with that measured by a conventional wavelength-scanning method. From the analysis of the difference spectra, the noise ratio was evaluated to be similar to 3 x 10(-3), which is sufficiently small to trace minute changes in transient spectra induced by an ultrafast optical laser. This scheme enables us to perform single-shot, high-accuracy x-ray absorption spectroscopy with femtosecond time resolution. (C) 2013 AIP Publishing LLC.