The surface state near the top of the valence bands on the cleaved (111) face of Si has been investigated by using angular-resolved photoemission spectroscopy at the photon energy 10.2 eV. Anisotropy, dispersion, and splitting are observed. The results are consistent with an appreciable admixture of S₂ character in this surface-state band.
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Rowe et al. (1974) studied this question.
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