Surface diffusion of hydrogen on Pt(111): laser-induced thermal desorption studies

E. G. Seebauer, L. D. Schmidt

Research output: Contribution to journalArticle

Abstract

Surface diffusion of deuterium and hydrogen on Pt(111) has been investigated by laser-induced thermal desorption. As the initial surface coverage of deuterium is varied from 0.001 to 0.33, the diffusional activation energy falls from 12 to 7 kcal mol, and the pre-exponential factor falls from 3 × 104 to 0.5 cm2/s. Concentration profiles measured directly by a variable aperture technique confirm that at 234 K deuterium diffusion slows at low coverage. Hydrogen diffuses about twice as fast as deuterium.

Original languageEnglish (US)
Pages (from-to)129-133
Number of pages5
JournalChemical Physics Letters
Volume123
Issue number1-2
DOIs
StatePublished - Jan 3 1986
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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