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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