Abstract
The longitudinal vibrations and the vibrations of valence defects of the PtX linear chains are described in the framework of a one-dimensional model in the first nearest neighbors interaction approximation. The dynamical properties of the perfect chain are parametrized by two force constants K 1 (for the Pt IV-Cl interaction) and K 2 (for the Pt II-Cl interaction) and several defects can be described by only one additional parameter, K d, corresponding to the Pt III-X force constant. The set of force constants is chosen in order to obtain a consistent description of the intrinsic frequencies (the ω 1 Raman active mode and two primary infrared active modes) and of the frequencies of the localized modes associated with the defects. A coherent description is obtained for K 2/K 1=0.30 in PtCl and K 2/K 1=0.37 in PtBr, a result consistent with an increase of delocalization from PtCl to PtBr. This analysis supports the assignment of the Raman lines associated with the electron polaron and electron bipolaron in the two materials.
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