Pump- and probe-wavelength dependencies of picosecond anti-stokes Raman spectrum of trans-stilbene in the S1 state

Takakazu Nakabayashi, Hiromi Okamoto, Mitsuo Tasumi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Vibrational relaxation dynamics of trans-stilbene in the S1 state immediately after photoexcitation is studied by picosecond time-resolved anti-Stokes Raman spectroscopy with several pump and probe wavelengths. Pump-wavelength dependence of the anti-Stokes spectrum indicates that, when pump photons with high excess energy (≈5200cm-1) are used, the anti-Stokes Raman bands at 0 ps delay time arise from vibrationally excited transients with excess vibrational energy not thermally distributed in the molecule. Probe-wavelength dependence suggests that the vibrationally excited transients at 0 ps are mostly on the lowest excited vibrational levels, as far as the olefinic C = C stretching and the C-Ph stretching modes are concerned. The vibrational relaxation process of S1 trans-stilbene is discussed on the basis of the observed results.

Original languageEnglish
Pages (from-to)75-78
Number of pages4
JournalLaser Chemistry
Volume19
Issue number1-4
DOIs
Publication statusPublished - 1999
Externally publishedYes

Keywords

  • Anti-Stokes Raman scattering
  • Resonance Raman excitation profiles
  • Time-resolved Raman spectroscopy
  • Vibrational relaxation
  • trans-stilbene

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Biochemistry
  • Spectroscopy

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