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Luminescence spectra of the crystalline alkalide Na+(cryptand [2.2.2] )Na" were studied from 7 to 80 K. Dye laser

The electrides are a peculiar class of ionic solids where the anions are replaced by electrons. The physical reasons for the stability of such an unconventional situation are explored on the basis of a self-consistent tight-binding Hartree-Fock calculation. The theoretical results are shown to provide a natural explanation for the formation of a lattice of trapped electrons. They also lead to correct predictions for the optical absorption spectrum and the Knight shift.

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