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1 July 1990 Rotationally anisotropic second-harmonic-generation studies of the structure and electronic properties of bimetallic interfaces: Ag on Cu(110)
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Abstract
Rotationally anisotropic surface second-harmonic generation (SHG) has been measured from a clean, well-ordered Cu(110) single-crystal surface as a function of both surface temperature and Ag coverage. For the clean Cu(110) surface, the temperature dependence of the SH response at a fixed azimuthal angle can be correlated with a surface phase transformation. A large decrease in the rotationally anisotropic SH response as a function of surface temperature can be related to changes in the surface disorder. The results are compared with other studies of Cu(110) surface structure using both x-ray and He-atom scattering. The rotationally anisotropic SH response has also been measured as a function of Ag coverage with the Cu(110) surface temperature fixed at 300 K. The results closely follow the formation of an ordered Ag(111)-like overlayer, the nucleation of three-dimensional Ag nanoclusters (<20 angstroms thick) that enhance the anisotropic SH response, and the subsequent growth of a ~10 monolayer thick Ag film. Variations in the rotationally anisotropic SH response as a function of Ag coverage are used to separate the resonant surface electronic contributions to the nonlinear susceptibility of the interface.
© (1990) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mark A. Hoffbauer and Victoria J. McVeigh "Rotationally anisotropic second-harmonic-generation studies of the structure and electronic properties of bimetallic interfaces: Ag on Cu(110)", Proc. SPIE 1208, Laser Photoionization and Desorption Surface Analysis Techniques, (1 July 1990); https://doi.org/10.1117/12.17876
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