Microwave spectrum of the boron monoxide radical, BO

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Abstract
The microwave spectrum of the boron monoxide radical in the ground electronic state X 2Σ+ has been observed by using a glow discharge cell spectrometer. The boron monoxide radical was generated in an absorption cell by a glow discharge in a gaseous mixture of boron trichloride, nitric oxide, and nitrogen. The observed transitions were N=1–0 and 3–2 in 100 and 300 GHz regions, respectively. The latter transition was observed by using a frequency multiplier working in the 300 GHz region as a microwave source. The spectra of two isotopic species 11BO and 10BO were analyzed to yield molecular parameters including the rotational constants, centrifugal distortion constants, spin‐rotation interaction constants, magnetic hyperfine interaction constants, and nuclear quadrupole interaction constants. The spin density of the unpaired σ electron was calculated from the magnetic hyperfine coupling constants and was found to be in good accordance with the result of ab initio calculations.