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 journalArticle

77 Citations (Scopus)

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

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hydrogen
metals
temperature
deuterium
crossovers
activation energy
temperature dependence

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Diffusion of hydrogen on Ni(111) over a wide range of temperature : Exploring quantum diffusion on metals. / Cao, G. X.; Nabighian, E.; Zhu, X. D.

In: Physical Review Letters, Vol. 79, No. 19, 10.11.1997, p. 3696-3699.

Research output: Contribution to journalArticle

Cao, G. X. ; Nabighian, E. ; Zhu, X. D. / Diffusion of hydrogen on Ni(111) over a wide range of temperature : Exploring quantum diffusion on metals. In: Physical Review Letters. 1997 ; Vol. 79, No. 19. pp. 3696-3699.
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