Anisotropic surface diffusion of CO on Ni(110)

Journal Article · Mon May 06 04:00:00 EDT 1991 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.66.2352· OSTI ID:5809063

Xiao, X; Zhu, X D; Daum, W; Shen, Y R ^[1]

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1. Department of Physics, University of California, Materials Sciences Division, Lawrence Berkeley Laboratory Berkeley, California 94720 (US)

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 (1{bar 1}0) and (001), were found. The measured diffusion coefficients yield the diffusion activation energies {ital E}{sub {ital d}}(1{bar 1}0)=1.1{plus minus}0.2 kcal/mol and {ital E}{sub {ital d}}(001)=3.1{plus minus}0.4 kcal/mol and the preexponential factors {ital D}{sub 0}(1{bar 1}0)=(3.8{plus minus}2.0){times}10{sup {minus}9} cm{sup 2}/sec and {ital D}{sub 0}(001)=(4.8{plus minus}4.4){times}10{sup {minus}6} cm{sup 2}/sec. The anisotropy in the surface diffusion appears to cross over at {ital T}{similar to}160 K.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5809063
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 66:18; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
360603* -- Materials-- Properties
ACTIVATION ENERGY
ANISOTROPY
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CHALCOGENIDES
CROSSING-OVER
DATA
DESORPTION
DIFFUSION
ELEMENTS
ENERGY
EPITAXY
EXPERIMENTAL DATA
FILMS
GRATINGS
HARMONICS
INFORMATION
INHIBITION
LASERS
LOW TEMPERATURE
METALS
NICKEL
NUMERICAL DATA
OSCILLATIONS
OXIDES
OXYGEN COMPOUNDS
TEMPERATURE EFFECTS
THIN FILMS
TIME DEPENDENCE
TRANSITION ELEMENTS