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Related Experiment Videos

Multiple scattering in low-energy electron holography

Shegelski1, Reid, Pow

  • 1Department of Physics, University of Northern British Columbia, Prince George, Canada. mras@unbc.ca

Ultramicroscopy
|August 17, 2000
PubMed
Summary
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This study reformulates low-energy electron point source (LEEPS) microscopy theory to include multiple scattering effects. Results show that LEEPS can reveal atomic structure even with significant multiple scattering, improving upon traditional low-energy electron diffraction (LEED) methods.

Area of Science:

  • Surface science
  • Materials science
  • Microscopy

Background:

  • Low-Energy Electron Point Source (LEEPS) microscopy offers potential for atomic-scale surface imaging.
  • Traditional LEEPS theory often simplifies scattering, neglecting multiple scattering events.
  • Understanding multiple scattering is crucial for accurate structural determination.

Purpose of the Study:

  • To reformulate LEEPS theory to incorporate multiple scattering.
  • To develop an algorithm for efficient matrix storage and solving structure factor equations.
  • To compare single and multiple scattering effects in LEEPS imaging of atomic clusters.

Main Methods:

  • Matrix formulation of LEEPS theory.
  • Development of an algorithm for structure matrix storage.

Related Experiment Videos

  • Iterative solution for the structure factor.
  • Kirchhoff-Helmholtz transform for image reconstruction.

    • Main Results:

    • Demonstrated LEEPS reconstruction of atomic clusters, considering multiple scattering.
    • Identified cases where excessive multiple scattering hinders reconstruction.
    • Showcased successful atomic structure revelations along and lateral to the optical axis despite significant multiple scattering.
    • Compared LEEPS results with Low-Energy Electron Diffraction (LEED) findings.

    Conclusions:

    • The reformulated LEEPS theory effectively accounts for multiple scattering.
    • LEEPS microscopy, even with strong multiple scattering, can provide valuable atomic structure information.
    • This approach enhances the capabilities of LEEPS for surface analysis compared to LEED.