Magnetic Resonance Absorption in Nitric Oxide

The nine-line magnetic resonance spectrum of ${\mathrm{N}}^{14}$ ${\mathrm{O}}^{16}$ is observed at fields in the range of 8600 oersted at a frequency of 9360 megacycle/sec. The spectrum arises from magnetic-dipole transitions between Zeeman levels in the $J=\frac{3}{2}$ state of the ${}_{}{}^2{}_{}{}^{}\Pi _{\frac{3}{2}}^{}{}_{}{}^{}$ spin component. The line positions allow a determination of the magnetic $\mathrm{IJ}$ coupling constant, which is 29.8±0.3 megacycle/sec., and the nuclear electric quadrupole coupling, which is -1.7±0.5 megacycle/sec. The line position and triplet spacings, which arise from molecular perturbations, are in good agreement with the theory of Margenau and Henry. The absolute intensity of the three stronger lines is measured to be ${\chi }^{\prime \prime }=1.2\mathrm{}\times {10}^{-10\mathrm{}}$ which also agrees with theory.