Abstract

A kinetic-cooling effect in the liquid phase has been observed by the use of pulsed optoacoustic spectroscopy. The magnitude of the optoacoustic signal in an aqueous Eu3+ solution, as measured from the absorption of pulsed light, was found to decrease when the excitation-laser wavelength was tuned to the transition from the thermally excited 7 F 1 state to the upper electronic 5 D 0 state of Eu3+ ion. This anomalous optoacoustic phenomenon is attributed to the kinetic-cooling effect.

© 1995 Optical Society of America

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