Ultrafast dynamics through conical intersections and intramolecular vibrational energy redistribution in styrene.
We report a femtosecond time-resolved photoelectron spectroscopy (TRPES) investigation of internal conversion in the first two excited singlet electronic states of styrene. We find that radiationless decay through an S(1)/S(0) conical intersection occurs on a timescale of ∼4 ps following direct excitation to S(1) with 0.6 eV excess energy, but that the same process is significantly slower (∼20 ps) if it follows internal conversion from S(2) to S(1) after excitation to S(2) with 0.3 eV excess energy (0.9 eV excess energy in S(1)).
Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK.
A D G
AD
Nunn
R S
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Minns
R
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Spesyvtsev
M J
MJ
Bearpark
M A
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Robb
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Fielding
D000465:Algorithms; D055598:Chemical Phenomena; D007834:Lasers; D008958:Models, Molecular; D056951:Photoelectron Spectroscopy; D020058:Styrene / Q000737:chemistry* / Q000528:radiation effects; D014466:Ultraviolet Rays
D020058:Styrene