Berlin 2005 – wissenschaftliches Programm

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MO: Molekülphysik

MO 31: Ultrafast Photochemistry

MO 31.1: Hauptvortrag

Montag, 7. März 2005, 10:15–10:45, HU 2091

Nuclear wavepacket motion in ultrafast chemical reactions in solution — •Tahei Tahara, Satoshi Takeuchi, and Kunihiko Ishii — Molecular Spectroscopy Laboratory, RIKEN, 2-1 Hirosawa, Wako 351-0198, Japan

Thanks to the improvement of ultrashort-pulse lasers, we are now able to directly observe nuclear wavepacket motion of excited-state polyatomic molecules in solution. We chose cis-stilbene, diphenylcyclopropenone and 10-hydroxybenzoquinoline that undergo prototypical ultrafast photochemical reactions (isomerization, dissociation and proton transfer, respectively), and carried out ultraviolet-visible two-color pump-probe experiments with time-resolution of 30 - 70 fs. In each system, we successfully observed the nuclear wavepacket motion of the excited state. We discuss the assignment of the motions observed and their relevance to the reaction coordinate [1,2].

1. K. Ishii, S. Takeuchi and T. Tahara, Chem. Phys. Lett., 398, 400 (2004).

2. S. Takeuchi and T. Tahara, J. Chem. Phys., 120, 4768 (2004).