飞秒时间分辨的光电子谱对苯S2态的超快动力学研究

doi:10.3866/PKU.WHXB201507061

Abstract

Abstract:

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.

Key words: Time-resolved, Photoelectron spectroscopy, Benzene molecule, Internal conversion, Intersystem crossing

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

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

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