Diffusion of hydrogen on Ni(111) over a wide range of temperature: Exploring quantum diffusion on metals

G. X. Cao, E. Nabighian, X. D. Zhu

Research output: Contribution to journalArticlepeer-review

79 Scopus citations

Abstract

We measured the temperature and azimuthal dependence of the diffusion rates of hydrogen (1H) and deuterium (2H) on Ni(111) from 65 to 240 K where the diffusion rates vary by 8 orders of magnitude. The diffusion of hydrogen crosses over from an activated behavior above 110 K to another activated behavior below 110 K with a smaller activation energy. By ruling out the possibility of a step effect, we suggest that the crossover is from a classical overbarrier hopping to a quantum mechanical underbarrier tunneling.

Original languageEnglish (US)
Pages (from-to)3696-3699
Number of pages4
JournalPhysical Review Letters
Volume79
Issue number19
StatePublished - Nov 10 1997

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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