Physics – Chemical Physics
Scientific paper
2007-10-02
Physics
Chemical Physics
14 pages including 2 tables and 3(4) figures, all pdf format
Scientific paper
Because of its inherent 2-D character, the eigenvalue equation for the hindered rotation around a normal cation site of an off-center impurity nearest-neighboring an F center is the well-known Mathieu equation. We present an overview of literature data on Mathieu's periodic functions providing exact solutions to the Li+ reorientational problem. We compare them with bottom-well approximating solutions by harmonic-oscillator functions at an effective vibrational frequency renormalized by both first- and third- order electron-mode coupling. We finally discuss the in-plane inversion polarizability of an off-center impurity assumed to form a dipole-dipole coupling with a nearby F center.
Baldacchini Giuseppe
Georgiev Mladen
Grassano U. M.
Ivanovich M.
Mladenova M.
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