期刊
REVIEW OF SCIENTIFIC INSTRUMENTS
卷 79, 期 12, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3048544
关键词
dysprosium; manganese; manganese compounds; XANES; X-ray emission spectra; X-ray fluorescence analysis; X-ray spectrometers
资金
- Office of Naval Research [N00014-05-1-0843]
- L. X. Bosack and B. M. Kruger Charitable Foundation
- U. S. Department of Energy, Basic Energy Science, Office of Science [DE-AC02-06CH11357]
- Natural Sciences and Engineering Research Council of Canada
- U. S. Department of Energy, Basic Energy Sciences, Office of Science [DE-AC02-06CH11357]
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.
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