Coherent Nuclear Wave
Packets Generated by Ultrafast
Intramolecular Charge-Transfer Reaction
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Abstract
Intramolecular charge-transfer (ICT) dynamics, including
reaction
coordinates, structural changes, and reaction rate, has been noted
experimentally and theoretically. Here we report the ICT dynamics
of laurdan investigated by time-resolved fluorescence at extreme time
resolution of 30 fs. A single high-frequency coherent nuclear wave-packet
motion on the product potential surface is observed through the modulation
of the fluorescence intensity in time. Theory and experiment show
that this vibrational mode involves large displacement of the carbon
atoms in the naphthalene backbone, which indicates that the naphthalene
backbone coordinates are strongly coupled to the ICT reaction of laurdan,
not the twisting or planarization of the dimethylamino group