Abstract
We report a new high-resolution spectroscopic technique designed for the study of short-lived free radicals and clusters containing free radicals. Excimer laser photolysis of a suitable precursor during the initial stages of a planar supersonic expansion is used to generate ultracold free radicals which are subsequently probed by a tunable far infrared laser. A detection limit of 10 8 molecules/cm 3 for light hydrides is demonstrated and prospects for 2 to 3 orders of magnitude improvement are discussed.
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