Abstract

We present here our new experimental and theoretical results concerning the low frequency beats in several polymethine dyes. Our studies show that the influence of the solvation dynamics on the beat behavior is not reduced only to the time evolution of the chromophore spectra (the increase in beats contrast due to the hole-burning effect in a solvation process). The important feature of our consideration is the coupling of the low frequency intramolecular vibrations, responsible for the beats, with the polar solvent and, as a concequence, the fast non-Markovian component of the beat attenuation with a memory, corresponding to the solvation correlation function.

© 1998 IEEE