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Abstract
We have recorded electronic EEL spectra of (001) faces of a number of simple ionic solids, with higher resolution and much lower beam currents than in previous work. We are able to confirm reports that some, but not all, solids show surface excitons at lower energy than the bulk values. We propose a new model for surface excitons, involving the excitation of an electron to a Rydberg-like state outside the crystal surface.
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