Abstract
In the framework of a new physical theory — quantum–classical mechanics, on the basis of a dynamic electron-nuclear-reorganization resonance and the law of conservation of energy, an explanation is given for the strong detuning of the resonance and the associated significant parasitic transformation of the shape of the resonant optical absorption band as a result of the transition from linear to nonlinear, two-photon absorption in polymethine dyes in solutions. Based on this explanation and model band shapes of the theoretical fit to the experimental optical bands (Hales et al. (2010)), the conditions for reconstructing the resonance shape of the band for two-photon absorption and its redshift are predicted.
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