The interactions of CN^- impurities in KCl are investigated by Raman light scattering in the spectral region of the CN^- stretching frequency. The low-temperature width and observed motional narrowing of the primary peak assigned to isolated cyanide impurities is attributed to interaction with non-near-neighbor defects in the lattice. A splitting is observed in a spectral feature attributed to CN^- pairs and attributed to a dynamical interaction (Davydov splitting). This suggests a model for nearest-neighbor pairing. The relative positions and intensities of downshifted sidebands are explained by this model.
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Grant et al. (1985) studied this question.
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