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Keywords:

  • chromophores;
  • conjugation;
  • solvent effects;
  • symmetry-breaking;
  • two-photon absorption

Abstract

A four essential-state model is proposed for a detailed description of optical spectra of a family of anionic polymethine dyes. Extensive spectroscopic data from the literature are quantitatively described within a model that accounts for non-adiabatic electron-vibration coupling and for polar solvation.