Anisotropic surface diffusion of CO on Ni(110)

Xu Dong Xiao, X. D. Zhu, W. Daum, Y. R. Shen

Research output: Contribution to journalArticle

46 Scopus citations

Abstract

Anisotropic surface diffusion of CO on Ni(110) has been studied using the newly developed technique of optical second-harmonic diffraction from a laser-induced CO monolayer grating. Two distinct orthogonal diffusion channels, along [110]_and [001], were found. The measured diffusion coefficients yield the diffusion activation energies Ed(110) = 1.1 ± 0.2 kcal/mol and Ed(001) = 3.1 ± 0.4 kcal/mol and the preexponential factors D0(110) = (3.8 ± 2.0) × 10-9 cm2/sec and D0(001) = (4.8 ± 4.4) × 10-6 cm2/sec. The anisotropy in the surface diffusion appears to cross over at T ̃ 160 K.

Original languageEnglish (US)
Pages (from-to)2352-2355
Number of pages4
JournalPhysical Review Letters
Volume66
Issue number18
StatePublished - 1991

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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