Knowledge Bank

The microwave spectrum of $NCN3$ has been studied between 11 and 36 KMc/sec at $-78\circ C$. Due to the cumulative quadrupole effects of four N atoms, the observed lines are in general about 2-3 Mc/sec. wide. The $\mu b$ dipole moment is very small and caused difficulty in the detection of b-type transitions. Low J a-type transitions have been observed for $\mathrm{<mrow\; data-mjx-texclass="ORD">35</mrow>}NCN3$ and $N12CN3$. Preliminary rotational constants for the normal isotopic species in the ground state are $A=38067Mc/sec.B=3184.6Mc/sec.C=2933.7Mc/sec$.