Abstract
The double proton transfer of [2,2′-BipyridyF]-3,3′-diol is investigated by UV-visible pump-probe spectroscopy with 30 fs time resolution. We find characteristic wavepacket motions for both the concerted and the sequential double proton transfer which proceed concurrently within 50 fs. The coherent excitation of an optically inactive, antisymmetric bending vibration is observed, demonstrating that the reactive process itself and not only the optical excitation drives the vibrational motions. We show by absence of a deuterium isotope effect on the proton transfer that the ESIPT dynamics is entirely determined by the skeletal modes and that it should not be described by tunneling of the proton.
© 2004 Optical Society of America
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