Abstract
In angle-resolved secondary-electron---emission spectra from a silicon (111)7\ifmmode\times\else\texttimes\fi{}7 surface there are two series of peaks which are not in the spectra of the unreconstructed (111)1\ifmmode\times\else\texttimes\fi{}1 surface. These peaks are interpreted by a two-step model; electrons are excited into surface-state resonances lying above the vacuum level, from which states they emerge into the vacuum. The dispersion curves of these states are presented and discussed.
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