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Observation of Quantum Coherence for Recurrence Motion of Exciton in Anthracene Dimers in Solution

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journal contribution
posted on 22.05.2003, 00:00 by Iwao Yamazaki, Naoki Aratani, Seiji Akimoto, Tomoko Yamazaki, Atsuhiro Osuka
The quantum beat signal associated with recurrence motion of exciton was observed for two types of anthracene dimers connected through a phenyl ring, on femtosecond fluorescence anisotropy decay. The time periods of oscillation were 0.3−0.9 ps, which correspond to exciton interactions of 30−50 cm-1, and the damping time constants (dephasing time) were 0.7−1.0 ps. The results show that the coherent aspect in photochemical processes is observable even in solution at room temperature, if one employs dimers of rigid structures.