Abstract

A method is described for performing supersonic jet spectroscopy of compounds dissolved in a liquid or supercritical fluid. The fluid is expanded through a capillary restrictor into a concentric sheath gas flow of argon. The resulting mixture undergoes further expansion through a 200-μm tapered nozzle. Laser-induced fluorescence of naphthalene is used to probe the cooling and focusing properties of the nozzle. A rotational temperature of 12 K has been obtained for a variety of fluid carriers. No fluorescence enhancement is observed along the centerline of the expansion relative to the results with a conventional free jet expansion.

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