A seven-crystal Johann-type hard x-ray spectrometer at the Stanford Synchrotron Radiation Lightsource
A seven-crystal Johann-type hard x-ray spectrometer at the Stanford Synchrotron Radiation Lightsource
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DOI：
10.1063/1.4803669
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发表时间：
2013-05-01
影响因子：
1.6
通讯作者：
Bergmann, U.
中科院分区：
文献类型：
--
作者：
Sokaras, D.;Weng, T. -C.;Bergmann, U.
我们提出了一个多晶体约翰型硬X射线光谱仪（类似5-18千电子伏）最近开发，安装，并在斯坦福大学同步辐射光源运行。该仪器设置在摇摆器光束线6-2处，配备有两个液氮冷却的单色器- Si（111）和Si（311）-以及准直和聚焦光学器件。该光谱仪由七个球形弯曲晶体分析仪放置在相交的垂直罗兰圆直径为1米。垂直扫描光谱仪，捕获扩展的背散射布拉格角范围（88度-74度），同时保持所有晶体在罗兰圆迹线上。该仪器在大气压下通过氦气袋操作，并且当使用所有七个晶体（每个投影直径为100 mm）时，具有约为4 π sr的0.45%的立体角。典型的分辨能力为E/Δ E的量级，类似于10 000。光谱仪的高检测效率与光束线6-2的特性相结合，允许常规研究X射线发射，高能量分辨率荧光检测X射线吸收和共振非弹性X射线散射非常稀释的样品，以及实施要求严格的原位环境。(C)2013 AIP Publishing LLC.
We present a multicrystal Johann-type hard x-ray spectrometer (similar to 5-18 keV) recently developed, installed, and operated at the Stanford Synchrotron Radiation Lightsource. The instrument is set at the wiggler beamline 6-2 equipped with two liquid nitrogen cooled monochromators - Si(111) and Si(311) - as well as collimating and focusing optics. The spectrometer consists of seven spherically bent crystal analyzers placed on intersecting vertical Rowland circles of 1 m of diameter. The spectrometer is scanned vertically capturing an extended backscattering Bragg angular range (88 degrees-74 degrees) while maintaining all crystals on the Rowland circle trace. The instrument operates in atmospheric pressure by means of a helium bag and when all the seven crystals are used (100 mm of projected diameter each), has a solid angle of about 0.45% of 4 pi sr. The typical resolving power is in the order of E/Delta E similar to 10 000. The spectrometer's high detection efficiency combined with the beamline 6-2 characteristics permits routine studies of x-ray emission, high energy resolution fluorescence detected x-ray absorption and resonant inelastic x-ray scattering of very diluted samples as well as implementation of demanding in situ environments. (C) 2013 AIP Publishing LLC.