Abstract
Abstract LEED (low-energy electron diffraction) has been used to characterize the early stages of structural reactions of a clean Si{111}7 × 7 surface with seven metals: Ag, Al, Ni, Pd, Pt, Ta and V. Room-temperature deposition of a few monolayer-equivalents modify the 7 × 7 into an α-7 × 7 structure common to all metals tested. Anneals of the latter structure yield √3 × √3–30° phases which produce different LEED intensities with different metals. Surprising exceptions are the √3 phases produced by Ag and Ta, which have practically identical corresponding LEED spectra. With further anneals, most of the metals tested here ultimately produce a 1 × 1 structure with strong structural similarities to the “quenched 1 × 1” phase that is formed by quenching an allegedly clean 7 × 7 structure from 1200°C to room temperature.
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