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Transient vibrational temperatures estimated from anti-Stokes and Stokes Raman intensities and vibrational cooling of electronically excited trans-stilbene in solution

✍ Scribed by Hiromi Okamoto; Takakazu Nakabayashi; Mitsuo Tasumi

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
78 KB
Volume
31
Category
Article
ISSN
0377-0486

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✦ Synopsis

To examine vibrational cooling of trans-stilbene in the S 1 state, transient temperatures of a few vibrational modes were estimated by analyzing transient anti-Stokes and Stokes Raman intensities. Vibrational temperatures obtained for the olefinic C C and C-Ph stretches are 900 and 680 K, respectively, at 0 ps after photoexcitation (temporal resolution ca 5 ps). These values are higher than the equilibrium temperature (ca 550 K) calculated for a statistical distribution of excess vibrational energy. Ultrafast intermolecular energy flow (vibrational cooling) is discussed based on a model analysis.

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Picosecond coherent Stokes and anti-Stokes raman spectra of hot S1 trans-stilbene in solution: The kinetics of vibrational cooling in the presence of “optical depletion”
✍ V.F. Kamalov; N.I. Koroteev; A.P. Shkurinov; B.N. Toleutaev 📂 Article 📅 1988 🏛 Elsevier Science 🌐 English ⚖ 494 KB

The experimental results of time-resolved coherent resonance Stokes and anti-Stokes Raman scattering spectroscopy of the excited electronic S, state of tram-stilbene in ethanol are presented. The detected considerable changes in vibrational spectra due to "optical depletion" of the population of the