Spectroscopic investigations of intramolecular relaxations in organic complex molecules
Some experimental results referring to vibrational and electronic (vibronic) relaxations in organic complex molecules are considered on the basis of simple models. The fundamental role of normal vibrational interactions is shown in the formation of mixed vibrational and vibronic molecular states, determining the dynamics of the absorbed light energy transformations. A convenient classification of the vibrational and vibronic states of molecules is suggested, based only on intramolecular interactions. Some examples of quantitative analyses of absorption and fluorescence spectra relationships are given for rather complicated cases.