Abstract

An overview of recent research on vibronic transitions of intraconfigurational 4f n transitions in rare earth ions is given. The strong variation in vibronic coupling strengths is shown to depend on the type of rare earth ion and the chemical nature of the ligands. In the discussion of the mechanism of vibronic coupling, new evidence for the importance of Δ process vibronics (or Franck-Condon phonon replicas) next to the usually considered M process vibronics (or vibrationally induced forced electric dipole transitions) is presented. Concentration enhancement of vibronic transitions in the excitation spectra of Pr 3+ in several covalent host lattices is reported. A model based on superexchange interaction between Pr 3+ ions over distances of about 11 Å can account for the observed concentration enhancement.

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