Knowledge Bank

The paramagnetic resonance spectra of $N15O17(2II3/2)$ and $N15O18(2II3/2)$ have been observed at 9325 MHz. The resonant magnetic fields for the hyperfine component of the Zeeman transitions were measured with a relative uncertainty of 10 ppm or less, and the hyperfine splittings for $N15$ and $O17$ were determined. Lin and Mizushima's theoretical expression describing the nitric oxide $spectrum1$ has been revised for the cases of the isotope-substituted species; the $O17$ hyperfine interactions were included to second order and the latest value of the spin-orbit coupling $constant2$ was used. The observed spectra were fitted semi-empirically to the resulting expressions. Magnetic hyperfine coupling parameters for oxygen in nitric oxide $(2II3/2)$ have been computed using the 23-dimensional SCF CI wave function of $Yamazaki,etal.3$.