Abstract

Stimulated-emission ion-dip spectroscopy was applied for the observation of the ground-state vibrational levels of jet-cooled phenol and its hydrogen-bonded complex with water. The observed ion-dip intensity, representing the stimulated emission from S₁ to the vibrational level in S₀ yields information about the intramolecular vibrational redistribution rate of the vibrational state. The intramolecular vibrational redistribution rate was estimated from the observed ion-dip intensities for the above species. It was found that a great enhancement of the intramolecular vibrational redistribution rate occurs with the formation of the hydrogen-bonded complex. The enhancement is ascribed to the increase of the density of the vibrational states contributed by the low-frequency hydrogen-bond modes.

© 1990 Optical Society of America

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