Effects of preadsorbed hydrogen on the adsorption of O2, CO and H2O on beryllium

S. Zalkind, M. Polak, N. Shamir

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The adsorption of O2, CO and H2O on a hydrogen precovered beryllium surface was studied using direct recoils spectrometry and Auger electron spectroscopy. It was found that preadsorbed hydrogen, in addition to adsorption site blocking, changes the Be electronic structure in a way that hinders the adsorption of O2 and CO on the surface. Apparently, repulsion between the preadsorbed hydrogen and adsorbed oxygen or CO creates depletion zones between them. For oxygen it also promotes agglomeration and penetration into the subsurface and leads to oxide nucleation at lower oxygen overages. For H2O, only a minor delay of adsorption and hydrogen replacement was observed.

Original languageEnglish
Pages (from-to)81-90
Number of pages10
JournalSurface Science
Volume539
Issue number1-3
DOIs
StatePublished - 1 Aug 2003

Keywords

  • Alkaline earth metals
  • Auger electron spectroscopy
  • Carbon monoxide
  • Chemisorption
  • Hydrogen atom
  • Oxygen
  • Water

ASJC Scopus subject areas

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

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