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Observation of intramolecular vibrational redistribution and vibrational cooling in S1 trans-stilbene and 2-phenylindene in solution

✍ Scribed by Jun Qian; Sandra L. Schultz; John M. Jean

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
534 KB
Volume
233
Category
Article
ISSN
0009-2614

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✦ Synopsis

Picosecond resonance Raman spectra of the S 1 states of trans-stilbene and its torsionally hindered analog 2-phenylindene in solution show that the vibrational cooling times in these two systems are similar. Anti-Stokes scattering from high frequency modes is observed for the first time and provides a direct observation of the IVR process. The data allow us to place a lower limit of 3-5 ps for the IVR time in trans-stilbene. These results provide significant new insight into ultrafast vibrational dynamics in solution and demonstrate the utility of time-resolved Raman spectroscopy as a probe of both intra-and inter-molecular energy transfer.

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