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DMITRY G. MELNIK, VADIM STAKHURSKY, VLADIMIR A. LOZOVSKY, TERRY A. MILLER AND C. BRADLEY MOORE, The Ohio State University, Dept. of Chemistry, Laser Spectroscopy Facility, 120 W. 18th Avenue, Columbus, Ohio 43210; FRANK C. DE LUCIA, The Ohio State University, Dept. of Physics, Microwave Laboratory, 174 W. 18th Avenue, Columbus OH 43210.
Asymmetrically deuterated methoxy radicals were experimentally studied in a direct absorption experiment using the pulsed jet FASSST spectrometer in the range of 153-251 GHz . The radical species were produced in a gas discharge in a supersonic jet by a Stark-free coaxial electrode arrangement, mounted on a top of the nozzle. Observed transitions were attributed to methoxy only if they satisfied the following criteria:\newline i) originated from a transient species, observable only under discharge conditions;\newline ii) appeared in spectra recorded with both precursors used (methanol and methyl nitrite);\newline iii) matched no reported transitions in other molecules (e.g. formaldehyde) found in discharge;\newline iv) exhibited paramagnetic properties.\par
The spectra were assigned by comparison of the experimentally obtained pattern with ones produced by the SpecView program using the available Hamiltonian and molecular constants with a subsequent fit of the experimental data to the theoretical model.