A reaction cell for ambient pressure soft x-ray absorption spectroscopy
A reaction cell for ambient pressure soft x-ray absorption spectroscopy
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DOI：
10.1063/1.5019333
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发表时间：
2018-05-01
影响因子：
1.6
通讯作者：
Torelli, P.
中科院分区：
文献类型：
--
作者：
Castan-Guerrero, C.;Krizmancic, D.;Torelli, P.
我们提出了一种新的实验装置，用于在环境压力下在软x射线范围内进行x射线吸收光谱（XAS）。通过超薄氮化硅薄膜作为x射线光束的窗口和大气样品环境的密封，环境压力XAS装置与同步辐射光谱光束线端站的超高真空环境完全兼容。XAS检测是在总电子产额（TEY）模式下进行的，用皮安计探测样品的漏极电流。在TEY模式下可实现的高信噪比，结合对x射线能量的连续扫描，使得在几秒钟内记录XAS光谱成为可能。第一个结果表明，即使在高度绝缘的样品情况下，该装置也可以记录在大气压下暴露的样品表面的快速XAS光谱。在反应池内使用永磁体，可以在环境压力下测量x射线磁圆二色性。AIP出版社出版。
We present a new experimental setup for performing X-ray Absorption Spectroscopy (XAS) in the soft X-ray range at ambient pressure. The ambient pressure XAS setup is fully compatible with the ultra high vacuum environment of a synchrotron radiation spectroscopy beamline end station by means of ultrathin Si3N4 membranes acting as windows for the X-ray beam and seal of the atmospheric sample environment. The XAS detection is performed in total electron yield (TEY) mode by probing the drain current from the sample with a picoammeter. The high signal/noise ratio achievable in the TEY mode, combined with a continuous scanning of the X-ray energies, makes it possible recording XAS spectra in a few seconds. The first results show the performance of this setup to record fast XAS spectra from sample surfaces exposed at atmospheric pressure, even in the case of highly insulating samples. The use of a permanent magnet inside the reaction cell enables the measurement of X-ray magnetic circular dichroism at ambient pressure. Published by AIP Publishing.