List references from the University of Geneva Physical Chemistry reference database

The results of a detailed optical and paramagnetic-resonance study performed on copper in CaF₂Â and silver in BaF₂Â are presented. Two different Ag⁺Â centers were identified in BaF₂. One is associated with an interstitial F^-Â ion whereas the other one has a cubic surrounding. The Cu²⁺Â ion in CaF₂Â was shown to reorient at 4.2 K between 6 equivalent minima ofÂ D_2hÂ symetry. This fact is interpreted with the aid of a T_2gx(T_2g+E_g) type Jahn-Teller effect. The nonlinear mixed coupling terms are shown to play an important role. The Cu⁺Â impurity in CaF₂Â is presumably off-center in the F^-Â sublattice without associated defect or impurity.

Defect association, Jahn-Teller or off-center effect in CaF₂:Copper, BaF₂:Silver ? V. Lefevre, A. Monnier, M. Schnieper, D. Lovy and H. Bill Zeitschrift für Physikalische Chemie, 200 (1997), p265-273 unige:2810 \| Abstract
The results of a detailed optical and paramagnetic-resonance study performed on copper in CaF₂Â and silver in BaF₂Â are presented. Two different Ag⁺Â centers were identified in BaF₂. One is associated with an interstitial F^-Â ion whereas the other one has a cubic surrounding. The Cu²⁺Â ion in CaF₂Â was shown to reorient at 4.2 K between 6 equivalent minima ofÂ D_2hÂ symetry. This fact is interpreted with the aid of a T_2gx(T_2g+E_g) type Jahn-Teller effect. The nonlinear mixed coupling terms are shown to play an important role. The Cu⁺Â impurity in CaF₂Â is presumably off-center in the F^-Â sublattice without associated defect or impurity.

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