Abstract
The polarized absorption and fluorescence spectra of Pr 3+ in single crystals of LiYF 4 having the scheelite structure have been investigated and assignments made on the basis of S 4 site symmetry. Strong vibronic coupling associated with the 3H 4→ 3H 5, 1D 2 transitions in absorption and the 3P 0→ 3H 4,6 transitions in fluorescence was observed. Using selection rules for vibronic coupling and the known k = 0 phonons, these “extra” features of the spectrum can be accounted for in polarization and frequency.
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