dc.creator Wood, D. L. en_US dc.creator Kaiser, W. K. en_US dc.creator Garrett, C. G. B. en_US dc.date.accessioned 2006-06-15T13:08:36Z dc.date.available 2006-06-15T13:08:36Z dc.date.issued 1961 en_US dc.identifier 1961-F-2 en_US dc.identifier.uri http://hdl.handle.net/1811/8067 dc.description Author Institution: Bell Telephone Laboratories, Inc. en_US dc.description.abstract Divalent rate earth ions in the $CaF_{2}$ lattice give rise to both broad band and sharp line absorption and emission (fluorescence) spectra. One of those systems, $CaF_{2}:Sm^{2+}$ shows very intense luminescence and has been successfully used as an optical maser material. The broad absorption bands for $CaF_{2}:Sm^{2+}$ break up into many components at low temperatures, and the oscillator strengths of the component lines are of the order of $10^{-3}$. These lines therefore must be due to parity allowed 4f-5d transitions. Other lines have oscillator strengths in the range from $10^{-4}$ to $10^{-6}$ and are due to 4f-4f transitions which are parity forbidden. The results of new measurements on the spectrum of $CaF_{2}:Sm^{2+}$ will be discussed in terms of the crystal field model of the rare earth ion in the lattice. Some remarks about the spectra of $Eu^{2+}$ and $Yb^{2+} CaF_{2}$ will also be include. en_US dc.format.extent 79181 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title ELECTRONIC SPECTRA OF DIVALENT RARE EARTH IONS IN $CaF_{2}$ en_US dc.type article en_US
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