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Related Experiment Videos

Backscattering X-ray standing waves in the XUV region.

T M Grehk1, W Drube, L Kipp

  • 1Hamburger Synchrotronstrahlungslabor HASYLAB am Deutschen Elektronen-Synchrotron DESY, Notkestrasse 85, 22603 Hamburg, Germany.

Journal of Synchrotron Radiation
|August 7, 2001
PubMed
Summary

Bragg reflection of extreme ultraviolet (XUV) radiation reveals structural disorder in layered titanium diselenide (TiSe2) crystals. This technique uses standing-wave fields to analyze materials with large unit cells.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Crystallography

Background:

  • Studying structural properties of crystalline materials with large unit cells is challenging.
  • Bragg reflection offers a potential method for such investigations.

Purpose of the Study:

  • To demonstrate the utility of Bragg reflection of extreme ultraviolet (XUV) radiation for analyzing structural properties of crystalline materials with large unit cells.
  • To investigate the structural properties of layered titanium diselenide (TiSe2) single crystals.

Main Methods:

  • Formation of a standing-wave field in a TiSe2 single crystal using near-backscattering geometry (theta = 88.5 degrees).
  • Measurement of partial electron yield as a function of photon energy across the (001) Bragg reflection condition (hv ≈ 1033 eV).

Related Experiment Videos

  • Comparison of experimental data with dynamical diffraction theory in the two-wave approximation.

    • Main Results:

    • The characteristic modulation of the partial electron yield was observed.
    • Comparison with theoretical models confirmed the applicability of the method.
    • The data revealed a significant amount of disorder along the c-axis of the TiSe2 crystal.

    Conclusions:

    • Bragg reflection of XUV radiation is an effective technique for studying structural properties of crystalline materials with large unit cells.
    • Layered TiSe2 single crystals exhibit substantial disorder along the c-axis.
    • The developed method provides insights into the structural characteristics of complex crystalline materials.