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

被引：2

作者：

Nakabayashi, T ^{[1
]}

Okamoto, H

Tasumi, M

机构：

[1] Univ Tokyo, Dept Chem, Sch Sci, Bunkyo Ku, Tokyo 113, Japan

[2] Univ Tokyo, Res Ctr Spectrochem, Sch Sci, Bunkyo Ku, Tokyo 113, Japan

来源：

LASER CHEMISTRY | 1999年 / 19卷 / 1-4期

关键词：

anti-Stokes Raman scattering; time-resolved Raman spectroscopy; resonance Raman excitation profiles; vibrational relaxation; trans-stilbene;

D O I：

10.1155/1999/10475

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Vibrational relaxation dynamics of trans-stilbene in the S-1 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 (approximate to 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 CIC stretching and the C-Ph stretching modes are concerned. The vibrational relaxation process of S-1 trans-stilbene is discussed on the basis of the observed results.

引用

页码：75 / 78

页数：4