Surface excitons on ionic crystals |
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| Institution: | 1. Chemistry Department, University of Colorado Denver, Denver, CO 80217-3364, United States;2. Department of Chemistry, Chemical Theory Center, and Minnesota Supercomputing Institute, University of Minnesota, Minneapolis, MN 55455-0431, United States;3. Centre for Computational Chemistry, East China University of Science and Technology, Shanghai 200237, China;4. Department of Chemistry, Pritzker School of Molecular Engineering, James Franck Institute, Chicago Center for Theoretical Chemistry, The University of Chicago, Chicago, IL 60637, United States |
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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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