Ultrafast decay dynamics of water molecules excited to electronic ′ and ′′ states: a time-resolved photoelectron spectroscopy study
文献情報
Zhigang He, Zhichao Chen, Kaijun Yuan, Dongxu Dai, Guorong Wu, Xueming Yang
The ultrafast decay dynamics of water molecules excited to ′1B1 and ′′1A2 states is studied by combining two-photon excitation and time-resolved photoelectron imaging methods. The lifetime of the ′1B1(000) state of H2O (D2O) is determined to be 1.54 ± 0.1 (22.6 ± 1.6) ps, consistent with a previous high-resolution spectroscopic study. The H2O ′′1A2(000) state decays with a lifetime of 4.1 ± 0.2 ps, while in the D2O ′′1A2(000) state, two independent decay pathways are observed, with time constants of 0.55 ± 0.1 and 13 ± 1 ps, respectively. The former is proposed to be associated with a hitherto undocumented ′′ → pathway, induced by Coriolis interaction.
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