Optical second-harmonic diffraction study of anisotropic surface diffusion: CO on Ni(110)

Journal Article · Thu Oct 15 04:00:00 EDT 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.46.9732· OSTI ID:7080295

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 (United States)

We describe in detail a technique using optical second-harmonic (SH) diffraction from a one-dimensional laser-induced monolayer grating to probe surface diffusion of adsorbates and its anisotropy on a solid surface. The case of CO on Ni(110) is used as a demonstration. The two orthogonal and independent diffusion tensor components along (1{bar 1}0) and (001) are measured, exhibiting a strong anisotropy in both the activation energy {ital E}{sub diff} and the preexponential factor {ital D}{sub 0} in the diffusion coefficients. A compensation effect between {ital E}{sub diff} and {ital D}{sub 0} is observed. In comparison with CO/Ni(111) and CO/Ni(100), our result suggests that the Ni(110) surface seen by CO is much smoother than Ni(111) and Ni(100). Both advantages and limitations of the present technique are mentioned and possible complications in the data analysis are discussed.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7080295
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 46:15; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
ANISOTROPY
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
COHERENT SCATTERING
DATA
DIFFRACTION
DIFFUSION
ELEMENTS
EXPERIMENTAL DATA
FREQUENCY MIXING
GRATINGS
HARMONIC GENERATION
INFORMATION
LASERS
METALS
NICKEL
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SURFACE PROPERTIES
TENSORS
TRANSITION ELEMENTS