TOF spectra of direct recoils. II. Interaction of H2 with clean and oxidized magnesium

Moshe H. Mintz, J. Albert Schultz, J. Wayne Rabalais

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32 Scopus citations


The interaction of gaseous hydrogen with clean and oxidized polycrystalline magnesium surfaces has been studied by time-of-flight (TOF) analysis of directly recoiled surface atoms (neutrals plus ions) produced by pulsed Ar+ ion irradiation. The spectra exhibit no surface hydrogen for H2 exposures up to 2000 L on clean magnesium, indicating that either hydrogen does not react at all or it reacts to yield a totally subsurface hydrogen product. Oxidized magnesium reacts with H2 to yield a product with a surface stoichiometry of approximately one hydrogen to one MgO pair. The H2/MgO reaction kinetics fit a one-site adsorption model with H2 sticking probability of 8 × 10-4. The direct recoil technique is sensitive to the structural change resulting from the reaction of hydrogen with MgO.

Original languageEnglish
Pages (from-to)457-466
Number of pages10
JournalSurface Science
Issue number2-3
StatePublished - 1 Nov 1984
Externally publishedYes

ASJC Scopus subject areas

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


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