Optical second harmonic study of Sb adsorption on Ge(111)

K. A. Schultz, I. I. Suni, C. E. Allen, E. G. Seebauer

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The adsorption of Sb on Ge(111) has been examined by optical second harmonic generation (SHG) in combination with low-energy electron diffraction, Auger spectroscopy, and temperature programmed desorption (TPD). Adsorption at room temperature yields a layer that must be annealed to at least 675 K in order to relax the adsorbate to an equilibrium configuration. This relaxed layer forms an ideally terminated (1 × 1) structure with a saturation coverage θSb of one monolayer. TPD indicates that Sb desorbs with an activation energy ED = 65 kcal/mol, which is similar to the heat of vaporization of bulk Sb. SHG measurements show that the nonlinear susceptibility χ(2)xxx changes sign at θSb = 0.48. Such an effect has never been reported previously, and indicates that Sb induces substantial charge redistribution in the top layers of Ge.

Original languageEnglish (US)
Pages (from-to)40-49
Number of pages10
JournalSurface Science
Issue number1-3
StatePublished - Oct 1 1992

ASJC Scopus subject areas

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


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