Citation: SHEN Huan, ZHANG Bing. Ultrafast Dynamics of Benzene on the S₂ State Investigated by Femtosecond Time-Resolved Photoelectron Spectroscopy[J]. Acta Physico-Chimica Sinica, ;2015, 31(9): 1662-1666. doi: 10.3866/PKU.WHXB201507061 shu

Ultrafast Dynamics of Benzene on the S₂ State Investigated by Femtosecond Time-Resolved Photoelectron Spectroscopy

SHEN Huan ^1, ,
ZHANG Bing ²

1.
1 College of Science, Huazhong Agricultural University, Wuhan 430070, P. R. China;
2 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China

Received Date: 10 April 2015
Available Online: 6 July 2015
Fund Project: 国家自然科学基金(21403080)资助项目 (21403080)

The ultrafast dynamics of benzene on the S₂ state have been investigated by femtosecond time-resolved mass spectroscopy coupled with photoelectron imaging. The benzene molecule was excited to the S₂ state by two 400 nm photons, and subsequently probed by one 267 nm photon. The timedependent ion yield of the parent ion consists of two components with different lifetimes. The first component at (90 ± 1) fs is because of internal conversion from the S₂ state to the S₁/S₀ state. The second one, i.e., (5.0 ± 0.2) ps, is due to decay of the S₁ state. The observed lifetime of the second component is shorter than previous results, indicating the existence of an additional decay process. With photoelectron spectra extracted from the time-resolved photoelectron imaging, this newly found deactivated process is assigned to intersystem crossing from the vibrational excited S₁ state to the hot triplet state T₃.
- Time-resolved,
- Photoelectron spectroscopy,
- Benzene molecule,
- Internal conversion,
- Intersystem crossing
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Ultrafast Dynamics of Benzene on the S₂ State Investigated by Femtosecond Time-Resolved Photoelectron Spectroscopy