A short working distance multiple crystal x-ray spectrometer

Rev Sci Instrum. 2008 Dec;79(12):123112. doi: 10.1063/1.3048544.

Abstract

For x-ray spot sizes of a few tens of microns or smaller, a millimeter-sized flat analyzer crystal placed approximately 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 Kbeta 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 Lalpha(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.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Calibration
  • Crystallization
  • Equipment Design
  • Lasers
  • Manganese Compounds / chemistry
  • Materials Testing
  • Models, Theoretical
  • Optics and Photonics
  • Oxides / chemistry
  • Scattering, Radiation
  • Spectrometry, X-Ray Emission / instrumentation*
  • Spectrometry, X-Ray Emission / methods
  • X-Rays

Substances

  • Manganese Compounds
  • Oxides
  • manganese oxide