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The coupling between lattice vibrations and electrons in the partly filIed shells of paramagnetic ions is normaIIy presumed to take place via a localized complex consisting of the paramagnetic ion surrounded by its ligands. In such cases the number of parameters is reduced significantly by the use of the superposition model. This model, with some related approximations, has been employed to determine coupling parameters for fluorine, chlorine and oxygen ligands using both experimental and theoretical results.

The Orbit?Lattice Interaction for Lanthanide Ions. I. Determination of Empirical Parameters