High resolution x-ray absorption spectroscopy with absolute energy calibration for the determination of absorption edge energies

TLDR

The spectrometer incorporates a high‑resolution four‑crystal reflection monochromator that calibrates x‑ray absorption edges from 6 to 36 keV with a relative uncertainty of 10⁻⁵–10⁻⁶, achieved by suppressing harmonics and minimizing instrumental effects to yield intrinsic spectra. The monochromator meets these stringent criteria, demonstrating high stability, and the copper K‑edge calibration confirms its accuracy against previously tabulated edge energies.

Abstract

The general characteristics and spectrometric features of a high resolution four-crystal reflection x-ray monochromator with wavelength analysis installed at the HASYLAB beam line L at DESY are presented. The monochromator is part of a spectrometer developed to calibrate x-ray absorption edge spectra in the energy range of 6–36 keV with a relative uncertainty ΔE/E from 10−5 to 10−6. This requires an extremely effective suppression of harmonics and also a negligible instrumental influence in order to obtain almost intrinsic spectra. As the results show, the monochromator fulfills the requirements, including very high stability. An example of the calibration procedure for the copper K edge is given as well as a comparison of the remeasured absorption edge energies with the previously tabulated data.