The experiments described above show the great sensitivity of time-resolved resonance Raman spectroscopy to the changes taking place during the relaxation of photoexcited molecules in solution. During the time that excess energy is transferred to the solvent, there are changes in vibrational frequencies and bandwidths, in level populations and also, if the quaterphenyl results are confirmed, in electronic energies. These dynamic effects all have parallels in the changes which take place on slow timescales with variations in solvent temperature, but the static temperature dependencies and dynamic changes also differ. The sharpness of the quaterphenyl excitation profiles and the possibility that the resonance parameters may change with time confirms the need for measurements of this kind of the anti-Stokes spectrum of stilbene to determine the degree to which non-equilibrium populations contribute to the observed changes in band intensities.