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Electron supersurface scattering on polycrystalline Au.

Wolfgang S M Werner1, Mihály Novák, Francesc Salvat-Pujol

  • 1Institute of Applied Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, A 1040 Vienna, Austria. werner@iap.tuwien.ac.at

Physical Review Letters
|March 12, 2013
PubMed
Summary

Supersurface electron scattering significantly impacts electron spectra. Removing this effect aligns experimental data with Landau-Goudsmit-Saunderson theory, revealing its crucial role in quantitative analysis.

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Area of Science:

  • Physics
  • Surface Science
  • Materials Science

Background:

  • Electron scattering is fundamental to understanding material properties.
  • Existing theories often neglect phenomena occurring above the sample surface.
  • Supersurface electron scattering (SES) involves energy losses and deflections in vacuum.

Purpose of the Study:

  • To experimentally verify theoretical predictions of SES.
  • To investigate the influence of SES on electron backscattering spectra.
  • To determine the necessity of accounting for SES in quantitative electron spectroscopy.

Main Methods:

  • Experimental measurement of 500-eV electron backscattering from an Au surface.
  • Varying incidence angle to 70° and scattering angles from 37° to 165°.

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  • Analyzing electron spectra before and after accounting for SES contributions.

    • Main Results:

    • Observed strong oscillations in supersurface backscattering probability, anticorrelated with Ramsauer-Townsend minima.
    • Experimental data, after removing SES, showed agreement with Landau-Goudsmit-Saunderson (LGS) theory.
    • Raw experimental data, including SES, were anticorrelated with LGS theory.

    Conclusions:

    • Supersurface scattering is a significant factor in electron spectra.
    • Accounting for SES is essential for quantitative agreement with established theories like LGS.
    • This finding necessitates re-evaluation of electron spectroscopy data analysis.