Knowledge Bank

The microwave spectrum of $N2:CH\cdot CN$ has been studied between 12 and 28 kMc/sec at a temperature of between -30 and $-35\circ C$. Preliminary rotational constants for the normal isotopic species in the ground state are $A=29,102.6$ Mc/sec., $B=3024.8$ Mc/sec., and $C=2735.7$ Mc/sec. The value of the inertial defect, $\Delta =+0.291$ amu$\cdot$ {\AA}$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}$, indicates that the molecule is planar. Lines in the spectrum due to molecules in the first excited state of a vibration with a frequency of approximately $115cm-1$ have been observed.