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Published March 1, 1978 | public
Journal Article

Measurements of molecular dephasing and radiationless decay by laser-acoustic diffraction spectroscopy


In this paper we present a method for the measurements of molecular dephasing and radiationless decay in gases and solids. The technique utilizes a single-mode of a tunable dye laser and an extracavity acousto-optic element. The latter diffracts the laser beam into or out of the sampe for finite times when a train of radio frequency pulses is fed into the transducer. Using this laser-acoustic diffraction spectroscopy (LADS) we report some new results on iodine gas, and pentacene in a p-terphenyl host at 1.8 K. Combining these new results of LADS on pentacene and our earlier findings using the frequency switching method we present an analysis for the effect of laser bandwidth on the decay of the prepared excited states.

Additional Information

© 1978 Elsevier B.V. Received 10 November 1977. This work was supported in part by the Research Corporation and in part by the Energy Research and Development Administration. Acknowledgement is also made to the donors or the Petroleum Research Fund, administered by the ACS, for partial support of this research. One of us (AHZ) would like to acknowledge a fruitful discussion with M. Levenson of use regarding the possible connections between the observation of the beats in the echo experiment and Ramsey's fringes.

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