Abstract
The femtochemistry of the indole molecule which represents the chromophore of the amino acid trypophan is of particular interest because of its biological relevance. Recent studies (e.g. [1]) of indole in aqueous solution have shown that the photoexcitation leads to a fast charge separation process characterized by the formation of a solvated electron. The microscopic mechanism of the solvation process can be elucidated by gas phase studies of indole-solvent clusters with polar molecules like water or ammonia. Recent ab initio investigations of indolewater clusters have stressed the crucial role of the nonadiabatic coupling between the optically excited ππ* and a low-lying dark πσ* state for the electron transfer process [2]. In first pump-probe experiments on indole (NH3)n clusters with ns laser pulses a H atom transfer reaction has been stated [3].
© 2002 Optical Society of America
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