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The ultrafast internal conversion (IC) of piperidine has been observed by femtosecond time-resolved photoelectron imaging (TRPEI) coupled with time-resolved mass spectroscopy. The time evolution of the parent ion is well described by a rapid dephasing pathway with 62fs and a slow channel with 184fs. The fast dephasing is ascribed to the IC from the S1 state to S2 state, and the slower one is attributed...
The decay dynamics in excited states of 1,2,4-trimethylbenzene has been investigated by combining time-resolved photoelectron imaging with time-resolved mass spectroscopy. The ultrafast internal conversion from the initially optical excited S2 state to the vibration hot S1 state on time scale of 72fs is observed. The lifetime of secondary populated S1 state was determined to be about 16.4ps, which...
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