Interaction of Rare Gases and H2with Surfaces of Magnesium Oxide and Other Insulators

G. Vidali, M. Karimi

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

We propose a new model potential to describe the interaction between rare-gas atoms and H2with surfaces of insulators. The potential consists of a repulsive part calculated by using the effective medium theory and an attractive part due to dispersion forces. We find that our potential gives shallower well depths than given by experiments. However, if we let C6range within reasonable bounds, our potential fits the corrugation of the surface and the bound-state energies very well. We discuss in particular the He/MgO case, for which contradictory experimental results exist. Our model supports the recent data of Frankl'2 group, which predicts a shallower well depth than previously measured. We also comment on which parameters of the potentials should be known more accurately in order to bring calculations and experimental data to a closer agreement.

Original languageEnglish (US)
Pages (from-to)612-615
Number of pages4
JournalLangmuir
Volume5
Issue number3
DOIs
StatePublished - May 1 1989

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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