Coverage dependence of quantum tunneling diffusion of hydrogen and deuterium on Ni(111)

A. Wong, A. Lee, X. D. Zhu

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

We measured the diffusion rate of deuterium on Ni(111) as a function of temperature at atomic coverage of θ=0.3 and 0.05. In both cases, the crossovers from classical over-barrier hopping to under-barrier tunneling occurred at around T=125 K. At T=110 K, we measured the tunneling diffusion rates Dtunnel(θ) for both deuterium and hydrogen in the coverage range from θ=0.05 to 0.45 and found that (1) Dtunnel(θ) varied by less than a factor of 3; (2) the overall features of Dtunnel(θ) for the two isotopes were similar; (3) Dtunnel(θ) weakly peaked at around θ=0.25 and 0.5. Our results mostly agree with an early report by Lin and Gomer. Based on these results, we discuss the effect of the hydrogen-hydrogen interaction on hydrogen tunneling diffusion on Ni(111).

Original languageEnglish (US)
Pages (from-to)4418-4425
Number of pages8
JournalPhysical Review B
Volume51
Issue number7
DOIs
StatePublished - 1995

ASJC Scopus subject areas

  • Condensed Matter Physics

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