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Related Experiment Videos

X-ray Bragg diffraction in asymmetric backscattering geometry.

Yu V Shvyd'ko1, M Lerche, U Kuetgens

  • 1Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA. shvydko@aps.anl.gov

Physical Review Letters
|February 7, 2007
PubMed
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Asymmetrically cut crystals enable novel X-ray monochromatization by dispersing beams via Bragg diffraction. This method overcomes limitations of traditional X-ray reflection techniques.

Area of Science:

  • Condensed Matter Physics
  • X-ray Optics
  • Crystallography

Background:

  • Bragg diffraction is fundamental to X-ray crystallography and material analysis.
  • Traditional X-ray monochromatization methods have inherent limitations in spectral resolution and efficiency.
  • Asymmetric crystal cuts are explored for manipulating X-ray beam properties.

Purpose of the Study:

  • To investigate the effects of asymmetrically cut crystals on X-ray Bragg diffraction in backscattering geometry.
  • To explore a new method for X-ray monochromatization using these observed effects.
  • To characterize the angular dispersion and suppression of parasitic reflections.

Main Methods:

  • Experimental observation of X-ray Bragg diffraction in backscattering geometry using asymmetrically cut crystals.

Related Experiment Videos

  • Analysis of beam collimation, divergence, and angular dispersion post-reflection.
  • Measurement of X-ray wavelength-dependent reflection angles and dispersion rates.

    • Main Results:

    • Observed that exact Bragg backscattering occurs at non-normal incidence angles.
    • Demonstrated transformation of a collimated X-ray beam into a highly divergent beam with significant angular dispersion (approx. 8.5 mrad/eV).
    • Confirmed suppression of parasitic Bragg reflections accompanying the main Bragg backreflection.

    Conclusions:

    • Asymmetrically cut crystals act as dispersive elements, analogous to optical prisms, for X-rays.
    • The observed angular dispersion offers a novel, wavelength-dependent X-ray monochromatization technique.
    • This new method is not constrained by the intrinsic width of Bragg reflections, potentially improving X-ray spectral purity.