Knowledge Bank

The microwave spectrum of the lenear MgNC radical was observed for the first time in a high temperature cell coupled with DC discharge in a mixture of Mg vapor, cyanogen, and argon. The ground state ($\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Sigma$) spectrum observed between 250 and 370 GHz was analyzed to determine the rotational, centrifugal distortion, and spin-rotation constants: $B0=5966.8969(24)MHz,D0=0.0042338(35)MHz,H0=0.308(16)\times 10-7$ MHz, and $\gamma 0=15.219(13)$ MHz, with one standard deviation in parentheses. The obtained molecular constants enable us to assign six unidentified lines in $IRC+10216$ (Guelin $etal.1$) to the transitions of MgNC. Many spectral lines of the $\nu 2$ bending vibrational excited states have been also observed: The detail analysis will be presented.