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- W1988561640 abstract "The lanthanide elements are widely used as optical structural probes in solid state chemistry. Group theory and line positions are used to derive the symmetry and the number of crystallographic sites. For some compounds additional lines or illogical splittings make interpretation difficult. The Stark level widths depend on the phonon density of states in the material: if it is a continuous function the classical theory applies well, but if the phonon density of states is resolved into sharp peaks, zero-phonon line splittings may occur from resonance effects, with sharp phonons corresponding to the energy difference between Stark levels. Examples are shown for lanthanide organic compounds, and for some inorganic phases as well. Vibronic satellites occur prominently in some phases, especially if tetrahedral anions (phosphate etc…) are present. From the vibronics associated with simple electronic transitions it is possible to derive an effective density of phonon states. The puzzling case of Eu3+ in GdNbO4, where the fine structure of the emission spectrum depends on the optical excitation wavelength, is presented." @default.
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- W1988561640 date "1985-10-01" @default.
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- W1988561640 title "Vibronic optical transitions in inorganic and organic rare earth materials" @default.
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- W1988561640 doi "https://doi.org/10.1016/0022-5088(85)90022-0" @default.
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