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A theoretical study is made on He scattering from three fundamental classesof disordered ad-layers: (a) Translationally random adsorbates, (b) disorderedcompact islands and (c) fractal submonolayers. The implications of the resultsto experimental studies of He scattering from disordered surfaces arediscussed, and a combined experimental-theoretical study is made for Agsubmonolayers on Pt(111). Some of the main theoretical findings are: (1)Structural aspects of the calculated intensities from translationally randomclusters were found to be strongly correlated with those of individualclusters. (2) Low intensity Bragg interference peaks appear even for scatteringfrom very small ad-islands, and contain information on the ad-island localelectron structure. (3) For fractal islands, just as for islands with adifferent structure, the off-specular intensity depends on the parameters ofthe He/Ag interaction, and does not follow a universal power law as previouslyproposed in the literature. In the experimental-theoretical study of Ag onPt(111), we use first experimental He scattering data from low-coverage (singleadsorbate) systems to determine an empirical He/Ag-Pt potential of goodquality. Then, we carry out He scattering calculations for high coverage andcompare with experiments. The conclusions are that the actual experimentalphase corresponds to small compact Ag clusters of narrow size distribution,translationally disordered on the surface.

He scattering from random adsorbates, disordered compact islands, and fractal submonolayers: Intensity manifestations of surface disorder