Abstract

The recent progress in the development of ultrashort laser sources allows the optical excitation of molecular vibronic levels when the exciting pulse length is small compared with the vibrational period. Thus, in the excited electronic state it can be created a wave packet formed by a coherent superposition of vibrational eigenstates. The time evolution of such wave packets well localized in space in the quantum counterpart of the classical evolution and can provide a new insight into physical and chemical processes. In the experimental verification of the wave packet motion (for a review, see^[1]) also such interesting nonclassical effects as collapse, revival and fractional revival^[2] were found.

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