Abstract
A novel pulsed supersonic nozzle has been developed to produce intense cold beams of free radicals formed by laser photolysis in a high-pressure, fast-flow region within the nozzle. Photolysis of methyl benzoate in this apparatus efficiently formed the methoxy radical. Laser-induced fluorescence excitation spectra were obtained for the A tilde /sup 2/A/sub 1/ reverse arrow X tilde/sup 2/E sytem of the jet-cooled methoxy radical and the van der Waals complex CH/sub 3/OAr. Rotational analysis revealed that both of these radicals retain an electronic angular momentum of 0.4 h-bar in the /sup 2/E ground electronic state, and that the argon atom lies on the threefold symmetry axis on the oxygen end of methoxy.
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