Abstract
Fundamental aspects of inter-and intramolecular photoinduced electron transfer (ET) and related phenomena studied by means of ultrafast laser spectroscopy as well as some related theoretical problems are discussed. Picosecond transient absorption spectral studies have demonstrated the existence of various ET states depending upon the solvents in the typical intramolecular exciplex systems and TICT compounds. Behaviors of geminate radical ion-pairs (RIP) formed in the course of photoinduced ET and electron photoejection have been studied in various systems. In the case of the geminate RIP of aromatic donor-acceptor systems in polar solvents, recombination rate has showed a bell-shaped energy gap dependence contrary to the fact that the bimolecular rate constant of fluorescence quenching due to ET is quite insensitive to the, relevant energy gap. These results have been interpreted by a new theory for the energy gap dependence of ET.
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