Knowledge Bank

The pure rotational spectrum of nitric oxide was measured under high resolution $(\sim 0.06cm-1)$ using a lamellar grating $interferometer1$ over the frequency range $18-94cm-1$. The values of the effective rotational constants, $B0,D0$, and $H0$, were determined by least squares analyses; the values of the effective rotational constants. $B0$, are in close agreement with microwave $values.2,3$ The constants reproduce the observed spectrum to an average deviation of approximately $\pm 0.0012cm-1$. The unperturbed ground state constants are also given. The spin-orbit coupling constant $A0$, is discussed.