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We report the experimental observation of intrinsic dynamically localized vibrational states in crystals of the highly nonlinear halide-bridged mixed-valence transition metal complex Pt (en{) ₂Pt (en) ₂Cl₂ (ClO₄) ₄}, where en0ex{0ex}=0ex{0ex}ethylenediamine. These states are identified by the distinctive structure and strong redshifts they impose upon the overtone resonance Raman spectra. Quantitative modeling of the observed redshifts is presented based on a nonadiabatic coupled electron-lattice model that self-consistently predicts strong nonlinearity and highly localized multiquanta bound states.
Swanson et al. (Mon,) studied this question.