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- W2031008098 abstract "Excited states (scattering states) of free and bound electronic polarons in non metals are introduced and investigated in the continuum approximation. It is suggested that transitions to these states might lead to prominent resonances in the optical absorption at energies approximately twice the bandgap energy. A shift towards higher energies of the corresponding resonances in the energy loss function is calculated. Such resonances and the predicted shift are found in the experimental data for alkali halides; previously they have generally been attributed to plasma excitations. Limitations of the present model, due to the continuum approximation, (and related to the oscillator strength of the transitions) are discussed. The electronic polaron coupling constant a is calculated and tabulated for a number of alkali halides. Aangelagen toestanden worden berekend voor het elektronisch polaron (vry of gebonden) we suggereren dat overgangen naar deze toestanden kunnen leiden tot uitgesproken resonanties in de optische absorptie. De frekwentie van deze pieken is ongeveer tweemaal de frekwentie voor de vorming van een exciton. In de energie-verlies- funktie verschuiven deze resonanties naar hogere frekwenties. In de experimentele gegevens voor alkali halogeniden treft men deze pieken en de voorspelde vershuiving aan. Meestal werden deze resontanties als plasmonen beschreven. Beperkingen van het voorgestelde model worden besproken. Zij zign te wijten aan de continuum-benadering en betreffen de oscillator sterkte van de transities. De koppelingskonstante voor het elektronisch polaron wordt berekend en getabuleerd voor een aantal alkali-halogeniden." @default.
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- W2031008098 date "1972-09-01" @default.
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- W2031008098 title "A resonance of the electronic polaron appearing in the optical absorption of alkali halides" @default.
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- W2031008098 doi "https://doi.org/10.1016/0038-1098(72)90485-1" @default.
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