Cp. Hsu et al., TIME-DEPENDENT FLUORESCENCE-SPECTRA OF LARGE MOLECULES IN POLAR-SOLVENTS, The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory, 102(16), 1998, pp. 2658-2666
A method is described for incorporating the vibronic transitions of a
solute molecule in the calculation of the time evolution of its fluore
scence spectrum in a polar solvent. In this initial article, systems a
re treated in which the intramolecular vibrational relaxation is much
faster than the observed delay time. The overall fluorescence spectrum
is then shown to be a convolution of the steady-state absorption and
emission spectra of the solute in a nonpolar solvent and the time-depe
ndent emission line shape arising only from polar interactions. Calcul
ations are made for coumarin 153 in acetonitrile, using the dielectric
dispersion data of the solvent available from experimental measuremen
ts. The results are in encouraging agreement with experimental spectra
. Results are also given for the dynamic Stokes shift in methanol.