Abstract
We present an experimental study of the diffraction of He beams at the GaAs(110) surface. Diffraction angular scans and specular intensity scans are obtained for a wide range of incident angles, azimuths, and at two energies ( E = 0.063 eV and E = 0.021 eV ). The data have been qualitatively analyzed from a classical scattering viewpoint and the hard wall eikonal scattered wave approximation. A hardwall corrugation function of the form ζ(x, y) = 1 2 d x cos( 2πx L x) + 1 2 d y cos( 2πy L y) yields a qualitative fit to the data with d x ~ 1.1 Å and d y ~ 0.3 Å, w deep corrugation corresponds to going across the surface troughs. This value of d x is approximately half the corrugation of the nuclear positions. Specular intensity scans are analyzed in terms of interference in the normal momentum transfer, Δk ⊥, which yields structural information about vertical displacements. We discuss what is required in order to appropriately describe scattering from strongly corrugated surfaces.
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