Abstract

Cooling kinetics of trans-stilbene (tSB) photoexcited to a vibrationally excited state in the first excited singlet (S₁) manifold was studied with picosecond time-resolved Raman spectroscopy. The observed cooling curves of S₁tSB in chloroform (CHCI₃) and in chloroform-d (CDCl₃) were identical within the experimental uncertainties. For S₁tSB in chloroform, there was no experimental evidence for strong intermolecular vibration-vibration (V–V) resonance energy transfer in the picosecond to sub-picosecond time region.