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The angle-resolved photoemission spectrum of the ZnSe(110) surface is reexamined, with several of its prominent features (in particular, the previously unexplained one near - 4 eV) assigned to resonant one-electron surface states. The empty surface states observed in the electron-energy-loss spectra of ZnSe and ZnTe are interpreted as Zn $3d$ surface Frenkel excitonic resonances, caused by the final-state electron-hole interaction.
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Beres et al. (1982) studied this question.
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