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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
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Atomic imaging and direct phase retrieval using anomalous surface x-ray diffraction.

S A Pauli1, S J Leake, M Björck

  • 1Swiss Light Source, Paul Scherrer Institut, Villigen, Switzerland. philip.willmott@psi.ch

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 21, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces multi-wavelength anomalous diffraction for analyzing thin films. The method precisely determines surface structure factors, enabling direct calculation of electron density distributions for advanced materials analysis.

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Area of Science:

  • Materials Science
  • Crystallography
  • Surface Science

Background:

  • Accurate characterization of thin films, interfaces, and surfaces is crucial for advanced materials development.
  • Traditional surface X-ray diffraction methods can face challenges in directly determining complex structure factors.

Purpose of the Study:

  • To present and validate a multi-wavelength anomalous diffraction (MAD) method for thin films and surfaces.
  • To enable direct determination of complex surface structure factor amplitudes and phases.
  • To provide unambiguous electron-density distributions for initial structural analysis.

Main Methods:

  • Utilized surface X-ray diffraction data collected at three distinct energies around an element's absorption edge.
  • Developed an algorithm to directly compute complex surface structure factors from the multi-wavelength data.
  • Performed Fourier transformation of the structure factors to obtain electron-density distributions.

Main Results:

  • Demonstrated the ability to directly determine amplitudes and phases of complex surface structure factors.
  • Obtained meaningful and unambiguous electron-density distributions, serving as a starting point for refinement.
  • Validated the algorithm's robustness using simulated data and applied it successfully to real thin film data (SrTiO3 on NdGaO3).

Conclusions:

  • The multi-wavelength anomalous diffraction method offers a direct and powerful approach for surface and thin film structure determination.
  • The method provides unambiguous electron density maps, simplifying initial structural analysis and refinement.
  • Experimental limitations and algorithm stability have been assessed, confirming its applicability to real material systems.