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The diverse and fascinating properties of push-pull chromophores demonstrate their intrinsic non-linearity, and suggest that standard perturbative approaches are inadequate to describe their behavior. NLO responses of push-pull chromophores are strongly affected by the surrounding and large environmental effects are observed in absorption and emission spectra. Vibrational spectra show impressive dependence...
Recent exact results on the adiabatic DA dimer, as a model for static NLO properties of push-pull polyenes, are briefly reviewed. Emphasis is put on the non-linearity induced by the electron-phonon (e-ph) coupling and on the resulting huge amplification of non-linear responses. The Herzberg-Teller approach to e-ph coupling in the DA dimer is discussed as an approximate scheme to calculate vibronic...
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