A short working distance multiple crystal x-ray spectrometer

作者：Dickinson B; Seidler G T^*; Webb Z W; Bradley J A; Nagle K P; Heald S M; Gordon R A; Chou I M

来源：Review of Scientific Instruments, 2008, 79(12): 123112.

DOI：10.1063/1.3048544

• dysprosium
• manganese
• manganese compounds
• XANES
• X-ray emission spectra
• X-ray fluorescence analysis
• X-ray spectrometers

For x-ray spot sizes of a few tens of microns or smaller, a millimeter-sized flat analyzer crystal placed similar to 1 cm from the sample will exhibit high energy resolution while subtending a collection solid angle comparable to that of a typical spherically bent crystal analyzer (SBCA) at much larger working distances. Based on this observation and a nonfocusing geometry for the analyzer optic, we have constructed and tested a short working distance (SWD) multicrystal x-ray spectrometer. This prototype instrument has a maximum effective collection solid angle of 0.14 sr, comparable to that of 17 SBCA at 1 m working distance. We find good agreement with prior work for measurements of the Mn K beta x-ray emission and resonant inelastic x-ray scattering for MnO, and also for measurements of the x-ray absorption near-edge structure for Dy metal using L alpha(2) partial-fluorescence yield detection. We discuss future applications at third- and fourth-generation light sources. For concentrated samples, the extremely large collection angle of SWD spectrometers will permit collection of high-resolution x-ray emission spectra with a single pulse of the Linac Coherent Light Source. The range of applications of SWD spectrometers and traditional multi-SBCA instruments has some overlap, but also is significantly complementary.

• 出版日期2008-12