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学科主题: 物理化学
题名: Ultrafast dynamics of the S1 excited state and Rydberg state energetics of 2-picoline
作者: Wang BX(王丙星) ;  Liu BK(刘本康) ;  Wang YQ(王艳秋) ;  Wang L(王利)
会议名称: XXIII International Symposium on Molecular Beams
会议日期: 2009-6-1
出版日期: 2009-06-01
会议地点: 中国
通讯作者: 王利
部门归属: 十一室
主办者: 中国科学院大连化学物理研究所分子反应动力学国家重点实验室
摘要: For many years there have been interests in the excited electronic state of DNA and RNA bases because of their role in the UV photodamage of nucleic acids.[1] Pyridine, also called azabenzene, is a heterocyclic aromatic compound and its derivatives are biologically important components of nucleic acids (DNA, RNA). Femtosecond-resolved dynamics of S1 excited state of pyridine has been studied.[2-7] In this paper the ultrafast nonradiative dynamics of the S1 excited state of 2-picoline (or 2-methylpyridine) has been investigated. The time evolutions of the excited-state 2-picoline and fragments were followed by femtosecond-resolved mass spectrometry with (1+2′) resonance-enhanced multiphoton ionization via S1 state. Upon excitation into the so-called channel-three region, an ultrafast decay process was observed with a lifetime of several picoseconds. The ultrafast decay mechanism was discussed and assigned. Moreover, photoelectron imaging apparatus was used to obtain the photoelectron spectroscopy during the decay process. Photoelectron energy and angular distributions indicated that the two-photon ionization from the S1 state is enhanced by the resonance with 3s and 3p Rydberg states. The electronic energies of the 3s and 3p Rydberg states were determined for the first time.
语种: 中文
内容类型: 会议论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/113926
Appears in Collections:中国科学院大连化学物理研究所_会议论文

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Recommended Citation:
Wang BX,Liu BK,Wang YQ,et al. Ultrafast dynamics of the S1 excited state and Rydberg state energetics of 2-picoline[C]. 见:XXIII International Symposium on Molecular Beams. 中国. 2009-6-1.
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