Observation of a metastable precursor for adsorption of oxygen on Si(111) and the activation energy for chemisorption

C. Silvestre, M. Shayegan

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Abstract

Measurements of the work function of a Si(111) surface held at T20 K during exposure to O2 provide direct evidence for a precursor state preceding dissociative chemisorption. A striking feature of the precursor is its large surface dipole, resulting in a large positive work-function shift ( 1.6 eV). The precursor is effectively stable for T120 K, and converts to a final state upon heating the surface. Analysis of the dependence of on temperature and time indicates an activation energy of 40 meV for this conversion.

Original languageEnglish (US)
Pages (from-to)10432-10435
Number of pages4
JournalPhysical Review B
Volume37
Issue number17
DOIs
StatePublished - Jan 1 1988

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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