The Fundamental Rotation-Vibration Band of Nitric Oxide

The fundamental rotation-vibration band of nitric oxide has been measured with the high dispersion of an echellette grating spectrometer, and has been subjected to a complete analysis. The resulting constants have been carefully combined with those derived from the existing electronic data to yield the following molecular constants for the normal state of the molecule: ${\omega }_e=1904.03\left({}_{}{}^2{}_{}{}^{}\Pi _{\frac{1}{2}}^{}{}_{}{}^{}\right)$, $1903.68 \left({}_{}{}^2{}_{}{}^{}\Pi _{\frac{3}{2}}^{}{}_{}{}^{}\right) {\mathrm{cm}}^{-1\mathrm{}}$, ${\omega }_e{x}_e=13.97\mathrm{} {\mathrm{cm}}^{-1\mathrm{}}$, ${\omega }_e{y}_e=-1.20\mathrm{}\times {10}^{-3\mathrm{}}{\mathrm{cm}}^{-1\mathrm{}}$, $B_e=1.7046\mathrm{} {\mathrm{cm}}^{-1\mathrm{}}$, $I_e=16.423\mathrm{}\times {10}^{-40\mathrm{}} g {\mathrm{cm}}^2$, $r_e=1.1508\mathrm{}\mathrm{A}$.