Abstract
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 might be originated from internal conversion to ground state or intersystem crossing to triplet states.
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