Abstract

Optical spectra of triply-ionized praseodymium, neodymium, erbium and thulium ions in potassium zinc sulphate glass have been studied. Interaction and intensity parameters are derived. Radiative lifetimes and branching ratios for the fluorescent levels of the respective ions are evaluated. Splitting of certain bands, in their second derivative spectra, could satisfactorily be explained as being due to superposition of the vibrational modes of the sulphate ion on the electronic bands.

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