Rotation of X-ray polarization in the glitches of a silicon crystal monochromator

Sutter, John P.; Boada, Roberto; Bowron, Daniel T.; Степанов, С. А.; Díaz‐Moreno, Sofía

doi:10.1107/s1600576716009183

Cited by 8 publications

(8 citation statements)

References 28 publications

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“…1. These features are Bragg peaks, which arise when multiple sets of Bragg planes within the monochromator crystal are able to diffract X-rays of the same energy, leading to a decrease or increase in the diffracted intensity downstream towards the experimental sample (Chantler et al, 2010;Chantler & Deslattes, 1995;Quintana & Hart, 1995;Sutter et al, 2016;Bridges et al, 1991;Li et al, 1994). This effect can be seen in both sample measurements, although less clearly in the i-pr spectra.…”

Section: Appendix B Identifying Bragg Peaks Following Sectionmentioning

confidence: 99%

Solving self-absorption in fluorescence

Trevorah

Chantler

Schalken

2019

IUCrJ

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One of the most common types of experiment in X-ray absorption spectroscopy (XAS) measures the secondary inelastically scattered fluorescence photon. This widespread approach has a dominant systematic of self-absorption of the fluorescence photon. The large impact of self-absorption compromises accuracy, analysis and insight. Presented here is a detailed self-consistent method to correct for self-absorption and attenuation in fluorescence X-ray measurements. This method and the resulting software package can be applied to any fluorescence data, for XAS or any other experimental approach detecting fluorescence or inelastically scattered radiation, leading to a general solution applicable to a wide range of experimental investigations. The high intrinsic accuracy of the processed data allows these features to be well modelled and yields deeper potential insight.

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Section: Appendix B Identifying Bragg Peaks Following Sectionmentioning

confidence: 99%

Solving self-absorption in fluorescence

Trevorah

Chantler

Schalken

2019

IUCrJ

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“…More details about the samples and the experiment can be found in [22,23]. detector, one can derive the glitches' influence from the spatial distribution of the beam at the 2D detector [14,15]. However, this method is complicated and might not work for arbitrary samples and beamline configurations.…”

Section: Experiments and Data Processingmentioning

confidence: 99%

“…One more approach is to use the beam's change in polarization, which is due to a process termed "multiple-beam dynamical effects". By measuring the signal using a 2D detector, one can derive the glitches' influence from the spatial distribution of the beam at the 2D detector [14,15]. However, this method is complicated and might not work for arbitrary samples and beamline configurations.…”

Section: Introductionmentioning

confidence: 99%

Suppressing Diffraction-Related Intensity Losses in Transmissive Single-Crystal X-ray Optics

et al. 2021

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The highest-quality X-ray optics can be made of single-crystal materials such as silicon, germanium, or, even better, diamond. Unfortunately, such X-ray optics have one drawback: diffraction losses or the “glitch effect”. This effect manifests itself as follows: at some energies of X-rays, the intensity of the transmitted beam drops due to the fact that some crystalline planes have satisfied the diffraction condition. Diffraction losses are usually observed in spectroscopic experiments when the energy of the X-rays changes in a certain range. However, this effect might also influence any experiment using X-rays, especially at higher energies. In this paper, we propose a method to overcome the glitch problem in transmissive optics. This is achieved using small rotations of the optical element. We describe the algorithm for “glitch-free” measurements in detail and the theory behind it.

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“…Additionally, it has been recently found that, when collecting the fluorescence signal for very dilute samples using a large-area multi-element detector, these glitches do not compensate (Sutter et al, 2016). This occurs even after carefully tackling all the experimental issues mentioned above.…”

Section: Figurementioning

confidence: 99%

“…A fitting procedure treating coherent and Compton scattering developed by Sutter et al (2016) has shown that the spatial distribution of the quasi-elastically scattered intensity induces changes in the polarization of the incident beam on the sample as a monochromator glitch is traversed. In particular, when the reciprocal lattice vectors of the extra reflections do not lie in the scattering plane of the main diffracted beam, the coupling between the incident and the diffracted beams within the crystal induces a change in the polarization (mainly a rotation of the polarization).…”

Section: Figurementioning

confidence: 99%