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Time-resolved photoelectron imaging of ultrafast S2→S1 internal conversion through conical intersection in pyrazine

niuyingli 添加于 2010-11-29 13:46 | 1944 次阅读 | 0 个评论

作者
Suzuki Y-I, Fuji T, Horio T, Suzuki T
摘要
A nonadiabatic electronic transition through a conical intersection was studied by pump-probe photoelectron imaging spectroscopy with a 22 fs time resolution in the benchmark polyatomic molecule of pyrazine and deuterated pyrazine. The lifetimes of the S2 state of pyrazine and deuterated pyrazine were determined to be 22±3 fs by the global fitting of the time-energy maps of photoelectron kinetic energy (PKE) distributions. The lifetime of S3 was determined to be 40–43 fs. Two-dimensional maps of photoelectron distributions were obtained for time (t) and PKE, and individual PKE distributions upon ionization from S2 and S1 were extracted. Quantum beat with an approximately 50 fs period was observed after the S2→S1 internal conversion, which was attributed to the totally symmetric vibration ν6a in S1
详细资料
- 文献种类:期刊
- 期刊名称: The Journal of Chemical Physics
- 期刊缩写: J. Chem. Phys.
- 期卷页: 2010年第132卷第17期 174302页
- ISBN: 0021-9606
标签

pyrazine conical intersection
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附件
Time-resolved photoelectron imaging of ultrafast S2→S1 internal conversion through conical intersection in pyrazine