Abstract
The temperature dependence of the intensities of ƒƒ spectra is considered. The spectra of glasses of K13[Eu(SiW11O39)2] and K13[Ho(SiW11O39)2] have been obtained at 295 and 80 K. From this and other evidence it is concluded that for molecular complexes of the lanthanides in solution or in the solid state, the perturbation causing the intensity is predominantly static. A vibronic mechanism may be important for lanthanide ions in crystals.

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