George Simon J, Carpenter Matthew H, Friedrich Stephan, Cantor Robin
STAR Cryoelectronics, Santa Fe NM 87508 USA.
Lawrence Livermore National Laboratory, Livermore CA 94550 USA.
J Low Temp Phys. 2020 Sep;200(5-6):479-484. doi: 10.1007/s10909-020-02474-7. Epub 2020 Jul 4.
Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy is a powerful technique that gives element-specific information about the structure of molecules. The development of a laboratory EXAFS spectrometer capable of measuring transmission spectra would be a significant advance as the technique is currently only available at synchrotron radiation lightsources. Here, we explore the potential of cryogenic detectors as the energy resolving component of a laboratory transmission EXAFS instrument. We examine the energy resolution, count-rate, and detector stability needed for good EXAFS spectra and compare these to the properties of cryogenic detectors and conventional X-ray optics. We find that superconducting tunnel junction (STJ) detectors are well-suited for this application.
扩展X射线吸收精细结构（EXAFS）光谱学是一种强大的技术，可提供有关分子结构的元素特异性信息。能够测量透射光谱的实验室EXAFS光谱仪的开发将是一项重大进展，因为该技术目前仅在同步辐射光源上可用。在这里，我们探索了低温探测器作为实验室透射EXAFS仪器的能量分辨组件的潜力。我们研究了获得良好EXAFS光谱所需的能量分辨率、计数率和探测器稳定性，并将这些与低温探测器和传统X射线光学器件的特性进行了比较。我们发现超导隧道结（STJ）探测器非常适合此应用。
