Institut Néel CNRS-UGA, 25 Avenue des Martyrs, 38042 Grenoble, France.
J Synchrotron Radiat. 2023 Jan 1;30(Pt 1):111-125. doi: 10.1107/S160057752201116X.
Diffraction and spectroscopy instruments using a filtering process with several analyser crystals have existed for about 30 years at synchrotron radiation sources, but they are difficult to use on laboratory sources. Several diffraction multi-filtering systems for powder diffraction experiments have been studied and optimized, in order to show the relevance, simplicity and efficiency of their implementation. Optical filter systems containing one or many diffracting elements, precisely positioned in a rigid manner on a logarithmic spiral surface and having a stability that allows high resolution and high sensitivity to powder diffraction experiments, have been developed. After having tested prototypes with various geometries, we present in particular the realization of a small rigid-compact multi-analyser comb that allows 20-50 measurements on synchrotron radiation sources to be filtered in parallel, but also and especially that can be adapted on laboratory X-ray sources (Ag Kα) to increase by an order of magnitude the intensities and resolutions of the measurements. Such a rigid-compact multi-analyser block can advantageously be associated with photon-counting' 1D and 2D detectors in order to drastically improve the detection thresholds of powder diffraction measurements to better than 0.1%, which allows the detection/quantification/analysis of minor phases in studies of real' complex materials.
在同步辐射光源上，使用带有多个分析器晶体的滤波过程的衍射和光谱仪器已经存在了大约 30 年，但在实验室光源上使用它们却很困难。已经研究和优化了几种用于粉末衍射实验的衍射多滤波系统，以展示其实施的相关性、简单性和效率。开发了包含一个或多个衍射元件的光学滤波系统，这些元件以刚性方式精确地定位在对数螺旋表面上，并具有稳定性，允许对粉末衍射实验进行高分辨率和高灵敏度的测量。在测试了各种几何形状的原型之后，我们特别介绍了一种小型刚性紧凑型多分析器梳的实现，该梳可以在同步辐射光源上并行过滤 20-50 次测量，而且还可以适应实验室 X 射线源（AgKα），将测量的强度和分辨率提高一个数量级。这种刚性紧凑型多分析器块可以与“光子计数”1D 和 2D 探测器有利地结合使用，以大大提高粉末衍射测量的检测阈值，使其优于 0.1%，从而允许在对“真实”复杂材料的研究中检测/定量/分析次要相。
