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Solution of a multiple-scattering inverse problem: electron diffraction from surfaces.

D K Saldin1, A Seubert, K Heinz

  • 1Department of Physics, University of Wisconsin-Milwaukee, P.O. Box 413, Milwaukee, Wisconsin 53201, USA.

Physical Review Letters
|March 23, 2002
PubMed
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We developed a new method to determine surface atomic structures using low-energy electron diffraction. This approach directly analyzes measured data to reveal the 3D atomic arrangement of surface unit cells.

Area of Science:

  • Surface science
  • Materials science
  • Crystallography

Background:

  • Low-energy electron diffraction (LEED) is a surface-sensitive technique.
  • Analyzing LEED data to determine 3D atomic structure is complex.
  • Multiple-scattering effects complicate structural determination.

Purpose of the Study:

  • To present a solution for the multiple-scattering inverse problem in LEED.
  • To enable direct determination of 3D atomic structure of surface unit cells.
  • To utilize measured LEED data for structural analysis.

Main Methods:

  • Developed a solution for the multiple-scattering inverse problem.
  • Employed a maximum entropy algorithm for data analysis.
  • Required knowledge of the underlying bulk crystal structure.

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Main Results:

  • Successfully determined the 3D atomic structure of an entire surface unit cell.
  • Directly derived structural information from measured LEED data.
  • Validated the efficacy of the maximum entropy algorithm.

Conclusions:

  • The presented method provides a direct route to surface structure determination.
  • This approach overcomes limitations of previous LEED analysis techniques.
  • Enables precise characterization of surface atomic arrangements.