An estimation of surface vibration excitation cross sections of CO, O and H adsorbed on tungsten

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Abstract

A simple model is described for the evaluation of adatom loss spectra of dipole vibrations perpendicular to the substrate. It considers the inelastic electron scattering before and after specular reflection on the substrate. By comparing the loss to elastic peak area the total cross section σ of the inelastic electron scattering can be estimated. The model was used for evaluating experimental results published in the literature by Ibach, Froitzheim, Adnot, Backx and Barnes on the systems WCO, WO and WH. The main results are: for the CO 258 meV loss peak, σ = (11.6-18.3)×10-18cm2; for the O 78 meV loss peak, σ = (8.4-16.2) × 10-18 cm2; and for the H 130 and 155 meV loss peaks, σ =(0.73-2.2) × 10-18 cm2. They are close to the theoretical values. A reasonable agreement was found between σ values determined on WO and WβCO (dissociated) systems.

Original languageEnglish
Pages (from-to)155-160
Number of pages6
JournalSurface Science
Volume121
Issue number1
DOIs
Publication statusPublished - Sep 1 1982

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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