The microwave spectrum of the CH2N radical in the X̃ 2B2 ground electronic state

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Abstract
The rotational spectral lines of the CH2N radical in the 2uBd2d ground electronic state are detected by using a source-modulation microwave spectrometer. The radical is produced in a glow discharge plasma of a gaseous mixture of CH4 and N2. In total, 181 fine and hyperfine components of the rotational transitions with N=1–0 to N=5–4 are observed in the frequency region between 73 and 370 GHz. They are analyzed to obtain the molecular constants including hyperfine interaction constants for the H and N nuclei. The molecular structure and the spin density of CH2N are determined from the obtained molecular constants.