THE ATOMIC STRUCTURES OF THE SI(111)-SQUARE-ROOT-3XSQUARE-ROOT-3-AU AND SI(111)-6X6-AU SURFACES STUDIED BY LOW-ENERGY ION-SCATTERING
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abstract
Two Au-induced Si(111) reconstructions, the (3)1/2(3)1/2 and 66, were studied using impact-collision ion scattering spectroscopy with a 5-keV Li+ ion beam. The nearly identical ion scattering results for the two surfaces reveal that the local atomic structures of the (3)1/2(3)1/2 and 66 reconstructions are closely related. The scattered-ion angular distributions clearly show that the Au atoms are not embedded in the Si surface. A comparison of the experimental data with computer simulations gives excellent agreement for a model in which both surfaces are composed of a mixture of the honeycomb and centered hexagon structures proposed previously for these surfaces, although such a determination is not unique.
