Detectors for energy-dispersive EXAFS (EDE) experiments
Detectors for energy-dispersive EXAFS (EDE) experiments
复制标题
用于能量色散 EXAFS (EDE) 实验的探测器
DOI：
10.1016/j.nima.2005.07.039
复制
发表时间：
2005
影响因子：
1.4
通讯作者：
C. Ponchut
中科院分区：
文献类型：
--
作者：
G. Salvini;J. Headspith;S. Thomas;G. Derbyshire;A. Dent;T. Rayment;J. Evans;R. Farrow;S. Diaz;C. Ponchut
EXAFS（X射线吸收光谱精细结构）是近年来同步辐射科学中的一个重要工具。它已被广泛用于步进扫描模式，以提供静态和缓慢变化的样品内的局部环境信息。能量色散EXAFS（EDE）允许在更短的时间内收集类似的信息，从而能够研究真正动态变化的样品。该技术使用弯曲晶体单色器将能量分散的X射线束聚焦到样品上，然后撞击位于样品后面的阵列检测器。这允许在很短的时间内收集在一定范围内的能量的吸收。直到最近，只有少数系统已经存在的这种技术，通常采用商业上可获得的检测器最初构造用于其他应用。这些技术在速度、能量分辨率、线性和动态范围方面存在局限性，只能跟踪毫秒范围内的变化。利用英国ESPRC赠款基金，开发了一种新的探测器（XSTRIP），它在上述限制方面有了很大的改进，并证明了为研究人员开辟新的科学领域的潜力。本文将介绍的技术，一些历史的局限性，性能的提高所提供的XSTRIP系统和概述的未来方向的探测器，这个最令人兴奋的和重要的技术。
EXAFS, X-ray absorption spectroscopy fine structure, has been an important tool within synchrotron radiation science for some years. It has been used extensively in step scanning mode to provide information on the local environment within both static and slowly changing samples. Energy-dispersive EXAFS (EDE) allows similar information to be collected in a significantly shorter time frame, enabling the study of truly dynamically changing samples. The technique uses a bent crystal monochromator to focus an energy-dispersed X-ray beam onto a sample which then impinges upon an array detector positioned behind the sample. This allows the absorption over a range of energies to be collected in a very short period. Until recently only few systems have existed for this technique, typically employing commercially available detectors originally constructed for other applications. These presented limitations in speed, energy resolution, linearity and dynamic range and could only follow changes in the millisecond range. Using UK ESPRC grant funds, a new detector has been developed (XSTRIP) which shows great improvements over the above limitations and has demonstrated the potential to open new areas of science to researchers. This paper will present the technique, some of the historical limitations, the performance increase afforded by the XSTRIP system and an overview of the future direction of detectors for this most exciting and important technique.