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.
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