Optical Spectra of Neodymium and Europium Tungstates and Molybdates
L. Macalik, J. Hanuza
W. Trzebiatowski Institute for Low Temperatures and Structure Research, Polish Academy of Sciences, P.O. Box 937, 50-950 Wrocław, Poland

and J. Legendziewicz
Institute of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland
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Absorption and excitation spectra of lanthanides molybdates and tungstates were measured and analyzed. Probabilities of electronic transitions were analysed on the basis of the Judd-Ofelt theory. The significant differences of intensities were observed. Those differences could result from the symmetry changes, cooperative effects and electron-phonon interaction. The elucidation of intensities given by separate mechanisms needs further investigation.
DOI: 10.12693/APhysPolA.84.909
PACS numbers: 33.60.Cv, 33.50.Dq, 33.70.Ca, 78.20.Dj