Competing ultrafast intersystem crossing and internal conversion in the "channel 3" region of benzene

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Colleges, School and Institutes


We report new, detailed, femtosecond time-resolved photoelectron spectroscopy experiments and calculations investigating the competition between ultrafast internal conversion and ultrafast intersystem crossing in electronically and vibrationally excited benzene at the onset of "channel 3". Using different probe energies to record the total photoelectron yield as a function of pump-probe delay we are able to confirm that S-1, T-1 and T-2 electronic states are involved in the excited state dynamics. Time-resolved photoelectron spectroscopy measurements then allow us to unravel the evolution of the S-1, T-1 and T-2 components of the excited state population and, together with complementary quantum chemistry and quantum dynamics calculations, support our earlier proposal that ultrafast intersystem crossing competes with internal conversion (Chem. Phys. Lett., 2009, 469, 43).


Original languageEnglish
Pages (from-to)15607-15615
Number of pages9
JournalPhysical Chemistry Chemical Physics
Issue number48
Publication statusPublished - 1 Jan 2010