Abstract

The energy level structure of free trivalent rare earth (RE) ions is discussed and its modification by the crystal field described. Modification of the crystal field spectra in imperfect crystals are discussed. Intensities and linewidth are considered. The spectroscopy of solids employing lasers is described followed by the consideration of hyperfine interactions, energy transfer and glasses contains RE’s. Finally divalent RE ions and magnetic interactions are mentioned briefly.

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