Abstract
Ultrafast photoisomerization reaction of cis-stilbene in solution was studied by time-resolved absorption spectroscopy with 40-fs resolution. Rapidly damping coherence of a ∼220 cm−1 vibrational mode was observed in the reactive excited state. The obtained data showed that the initial wavepacket motion rapidly dephases owing to the significant anharmonicity of the S1 potential surface, and the isomerization proceeds after intramolecular vibrational energy redistribution.
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