Abstract
The ultrafast dynamics of the second singlet electronically excited state (S2) in o-xylene was investigated by femtosecond time-resolved photoelectron imaging. A new competing relaxation channel of the S2 state was observed and assigned to the T3 ← S2 intersystem crossing. Interestingly, it is found that the relaxation via this channel occurs on a comparable femtosecond timescale as the S1 ← S2 internal conversion. A lifetime of ~60 fs for the initially excited S2 state, of 540 (±17) fs for the secondary populated S1 state, and of 7.23 (±0.21) ps for the T3 state could be inferred.
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