STIMULATED-EMISSION ION-DIP SPECTRA OF PHENOL-H2O HYDROGEN-BONDED COMPLEX - ESTIMATION OF INTRAMOLECULAR VIBRATIONAL REDISTRIBUTION RATES OF GROUND-STATE VIBRATIONAL LEVELS

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 withwater. The observed ion-dip intensity, representing the stimulated emission from SI to the vibrational level in So, 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 foundthat 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.