Physics Department, University of Washington, Seattle, WA 98195, USA.
J Synchrotron Radiat. 2012 Mar;19(Pt 2):245-51. doi: 10.1107/S0909049511056081. Epub 2012 Jan 19.
Core-shell X-ray emission spectroscopy (XES) is a valuable complement to X-ray absorption spectroscopy (XAS) techniques. However, XES in the hard X-ray regime is much less frequently employed than XAS, often as a consequence of the relative scarcity of XES instrumentation having energy resolutions comparable with the relevant core-hole lifetimes. To address this, a family of inexpensive and easily operated short-working-distance X-ray emission spectrometers has been developed. The use of computer-aided design and rapid prototype machining of plastics allows customization for various emission lines having energies from ∼3 keV to ∼10 keV. The specific instrument described here, based on a coarsely diced approximant of the Johansson optic, is intended to study volume collapse in Pr metal and compounds by observing the pressure dependence of the Pr Lα emission spectrum. The collection solid angle is ∼50 msr, roughly equivalent to that of six traditional spherically bent crystal analyzers. The miniature X-ray emission spectrometer (miniXES) methodology will help encourage the adoption and broad application of high-resolution XES capabilities at hard X-ray synchrotron facilities.
核壳 X 射线发射光谱学 (XES) 是 X 射线吸收光谱学 (XAS) 技术的有力补充。然而，硬 X 射线区的 XES 的应用频率远低于 XAS，这通常是由于具有与相关空穴寿命相当的能量分辨率的 XES 仪器相对稀缺所致。为了解决这个问题，已经开发了一系列廉价且易于操作的短工作距离 X 射线发射光谱仪。使用计算机辅助设计和快速原型制造塑料允许针对具有从 ∼3 keV 到 ∼10 keV 能量的各种发射线进行定制。这里描述的特定仪器基于 Johansson 光学器件的粗糙切割近似物，旨在通过观察 Pr Lα 发射光谱的压力依赖性来研究 Pr 金属和化合物的体积塌缩。收集的立体角约为 50 msr，大致相当于六个传统球形弯曲晶体分析仪的收集立体角。微型 X 射线发射光谱仪 (miniXES) 方法将有助于鼓励在硬 X 射线同步加速器设施中采用和广泛应用高分辨率 XES 能力。
