Journal
OPTICS EXPRESS
Volume 18, Issue 6, Pages 5791-5801Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.005791
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Funding
- National Natural Science Foundation of China [10704083, 20673140]
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The dynamics of excited states in o-xylene molecules has been studied by femtosecond time-resolved photoelectron imaging coupled with time-resolved mass spectroscopy. The ultrafast internal conversion from the S-2 state to the vibrationally hot S-1 state on timescale of 60 fs is observed on real time. The secondarily populated high vibronic S-1 state deactivates further to the S-0 state on timescale of 9.85 ps. Interestingly, the lifetime of the low vibronic S-1 state is much longer, extrapolated to similar to 12.7 ns. The great differences of lifetime of different vibronic S-1 state are due to their different radiationless dynamics. (C) 2010 Optical Society of America
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