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Ultrafast dynamics through conical intersections and intramolecular vibrational energy redistribution in styrene

Nunn, ADG; Minns, RS; Spesyvtsev, R; Bearpark, MJ; Robb, MA; Fielding, HH; (2010) Ultrafast dynamics through conical intersections and intramolecular vibrational energy redistribution in styrene. PHYS CHEM CHEM PHYS , 12 (48) 15751 - 15759. 10.1039/c0cp01723j.

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Abstract

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 similar to 4 ps following direct excitation to S-1 with 0.6 eV excess energy, but that the same process is significantly slower (similar to 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).

Type: Article
Title: Ultrafast dynamics through conical intersections and intramolecular vibrational energy redistribution in styrene
DOI: 10.1039/c0cp01723j
Keywords: TIME-RESOLVED PHOTOELECTRON, VIBRONIC LEVEL FLUORESCENCE, GROUND ELECTRONIC-STATE, EXCITED-STATES, AB-INITIO, SPECTROSCOPY, SPECTRA, SINGLET, PHENYLACETYLENE, ABSORPTION
UCL classification: UCL > School of BEAMS > Faculty of Maths and Physical Sciences
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry
URI: http://discovery.ucl.ac.uk/id/eprint/704729
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