Solute-solvent energy transfer and cooling kinetics of photoexcited S-1 trans-stilbene probed with picosecond Raman spectroscopy: Comparison between chloroform and chloroform-d solutions

Cooling kinetics of trans-stilbene (tSB) photoexcited to a vibrationally ex cited state in the first excited singlet (S-1) manifold was studied with pi cosecond time-resolved Raman spectroscopy. The observed cooling curves of S -1 tSB in chloroform (CHCl3) and in chloroform-d (CDCl3) were identical wit hin the experimental uncertainties. For S-1 tSB in chloroform, there vias n o experimental evidence for strong intermolecular vibration-vibration (V-V) resonance energy transfer in the picosecond to sub-picosecond time region.