"Ultrafast excited state proton transfer and subsequent coherent skeletal motion of 2-(2'-hydroxyphenyl)benzothiazole"S. Lochbrunner, A. J. Wurzer, E. Riedle
J. Chem. Phys. 112, 10699 - 10702 (2000)
The excited state intramolecular proton transfer of 2-(2'- hydroxyphenyl)benzothiazole was investigated with 30 fstemporal resolution. The proton takes 60 fs to arrive at its S1 equilibrium position and the electron distribution changeson the same time scale. The molecule cannot adjust to the new structure of the H-chelate ring equally fast and starts tostrongly vibrate in four low frequency skeletal modes. This coherent wavepacket motion is the cause of theexperimentally observed strong signal oscillations that are only weakly damped despite the solvent environment.
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