The linear MgNC radical was detected, for the first time, by laboratory microwave spectroscopy, and six unidentified lines in IRC + 10216 reported by Guelin et al. (1986) were assigned to the transitions of this radical. The radical was produced in a free space absorption cell by a dc discharge in a mixture of magnesium vapor, argon, and cyanogen. Observed spectral lines in the 250-370 GHz region were analyzed by using the 2Sigma energy level expression, to give the rotational, centrifugal distortion and spin-rotation constants: B0 = 5966.8969(24) MHz, D0 = 0.004 2338(35) MHz, H0 = 0.308(16) x 10 exp -7 MHz, and gamma0 = 15.219(13) MHz, with one standard deviation in parentheses.
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Kawaguchi et al. (1993) studied this question.