期刊
JOURNAL OF CHEMICAL PHYSICS
卷 132, 期 17, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3395206
关键词
high-speed optical techniques; organic compounds; photoelectron spectra; potential energy surfaces; time resolved spectra
资金
- JSPS
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 S-2 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 S-3 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 S-2 and S-1 were extracted. Quantum beat with an approximately 50 fs period was observed after the S-2 -> S-1 internal conversion, which was attributed to the totally symmetric vibration nu(6a) in S-1. (c) 2010 American Institute of Physics. [doi: 10.1063/1.3395206]
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