The forbidden-reflection method for absorption coefficient measurement in many-wave x-ray diffraction in single crystals

Gabrielyan, R. Ts.; Kohn, V. G.

doi:10.1002/pssa.2210630145

Cited by 2 publications

(1 citation statement)

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“…Most practical applications assume the kinematic approach to be valid and dynamical effects are treated as a source of experimental error. However, especially for hard X-rays, large unit cells, and weak or even 'forbidden' reflections, the measured intensities can be dominated by MBD (Gabrielyan & Kohn, 1981), also called the Renninger effect (Newville, 2021) or Umweganregung. The investigation of the fine structure oscillations in resonant elastic X-ray spectroscopy (REXS) experiments (Richter et al, 2018;Weigel et al, 2023;Nentwich et al, 2016) suffers particularly from these effects (see Section 2), which have been either overlooked or perceived as disruptive and hence avoided (Laligant et al, 1989;Baruchel, 1993;Massa, 2007;Petcov, 1989).…”

Section: Introductionmentioning

confidence: 99%

Treatment of multiple-beam X-ray diffraction in energy-dependent measurements

Nentwich,

Zschornak,

Weigel

et al. 2024

J Synchrotron Radiat

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During X-ray diffraction experiments on single crystals, the diffracted beam intensities may be affected by multiple-beam X-ray diffraction (MBD). This effect is particularly frequent at higher X-ray energies and for larger unit cells. The appearance of this so-called Renninger effect often impairs the interpretation of diffracted intensities. This applies in particular to energy spectra analysed in resonant experiments, since during scans of the incident photon energy these conditions are necessarily met for specific X-ray energies. This effect can be addressed by carefully avoiding multiple-beam reflection conditions at a given X-ray energy and a given position in reciprocal space. However, areas which are (nearly) free of MBD are not always available. This article presents a universal concept of data acquisition and post-processing for resonant X-ray diffraction experiments. Our concept facilitates the reliable determination of kinematic (MBD-free) resonant diffraction intensities even at relatively high energies which, in turn, enables the study of higher absorption edges. This way, the applicability of resonant diffraction, e.g. to reveal the local atomic and electronic structure or chemical environment, is extended for a vast majority of crystalline materials. The potential of this approach compared with conventional data reduction is demonstrated by the measurements of the Ta L 3 edge of well studied lithium tantalate LiTaO3.

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