Ultrafast Decay Dynamics of N-Ethylpyrrole Excited to the S1 Electronic State: A Femtosecond Time-Resolved Photoelectron Imaging Study |
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Authors: | Wen-peng Yuan Bai-hui Feng Dong-yuan Yang Yan-jun Min Sheng-rui Yu Guo-rong Wu Xue-ming Yang |
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Institution: | a.Hangzhou Institute of Advanced Studies, Zhejiang Normal University, Hangzhou 311231, Chinab.State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Dalian 116023, Chinac.University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract: | N-ethylpyrrole is one of ethyl-substituted derivatives of pyrrole and its excited-state decay dynamics has never been explored. In this work, we investigate ultrafast decay dynamics of N-ethylpyrrole excited to the S1 electronic state using a femtosecond time-resolved photoelectron imaging method. Two pump wavelengths of 241.9 and 237.7 nm are employed. At 241.9 nm, three time constants, 5.0±0.7 ps, 66.4±15.6 ps and 1.3±0.1 ns, are derived. For 237.7 nm, two time constants of 2.1±0.1 ps and 13.1±1.2 ps are derived. We assign all these time constants to be associated with different vibrational states in the S1 state. The possible decay mechanisms of different S1 vibrational states are briefly discussed. |
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Keywords: | Photoelectron spectrum Pump/probe Femtosecond time-resolved |
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