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Electron density and structure of the (1 x 2)-Au(110) surface studied by He-beam scattering.

The (1×2)-Au(110) surface has been studied using He-beam scattering with time-of-flight detection. The experiments included measurement of the diffraction pattern and the specular intensity as a function of azimuthal angle of incidence; the latter curve is found to be highly structured. The data have been modeled using the local-density approximation to calculate the charge distribution in atoms, and treating the He-surface potential as a superposition of pseudopairwise terms. The diffraction pattern and azimuthal data can be well fitted using close-coupled channel calculations and varying only three parameters, giving confidence that the calculated electron density is accurate