Employing k-resolved inverse-photoemission spectroscopy, we have measured the dispersion of the unoccupied electronic surface-state band of cleaved single-domain Si(111) 2×{}1 along the {Γ}{}--J{} and {Γ}{}--J{}' symmetry directions. The energy dispersion and general shape of the measured surface-state band agree well with the calculated band of the {π}-bonded chain model.
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Perfetti et al. (1987) studied this question.
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