Abstract
If rare gas crystals did not actually exist, condensed matter theorists would have invented them. Elegantly simple, they are ordered cubic arrays of barely interacting closed shell atoms, held together only by Van der Waals attraction. Already in introducing the atomistic structure of self-trapped holes and excitons in alkali halides, we have invoked the paradigm of rare gases, describing the alkali halide ground state ions as “rare-gas-like.” Disruption of the rare-gas-like structure led to local collapse of the lattice, identified with self-trapping of the valence excitation. It seems only natural, therefore, that we begin detailed consideration of self-trapped excitons with the solid rare gases.
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