Ultrafast internal conversion of benzene and toluene from the S2 states was studied by time-resolved photoelectron imaging with a time resolution of 22 fs. Time−energy maps of the photoelectron intensity and the angular anisotropy were generated from a series of photoelectron images. The photoelectron kinetic energy distribution exhibits a rapid energy shift and intensity revival, which indicates nuclear motion on the S2 adiabatic surface, while the ultrafast evolution of the angular anisotropy revealed a change in the electronic character of the S2 adiabatic surface. From their decay profiles of the total photoelectron intensity, the time constants of 48 ± 4 and 62 ± 4 fs were determined for the population decay from the S2 states in benzene and toluene, respectively.

Topics
Vibrational states, Water transportation, Photoelectron imaging, Transition moment, Photoionization, Absorption spectroscopy, Isomerization, Heterocyclic compounds, Resonance-enhanced multiphoton ionization, Chemical compounds
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2011
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