Hyperfine Structure in the Paramagnetic Resonance of the Ion (SO3)2NO−−

Abstract

Paramagnetic resonance spectra of the free-radical ion ${\left(\mathrm{S}{\mathrm{O}}_3\right)}_2$N${\mathrm{O}}^{--}$ in dilute solutions were observed in fields up to 50 oersteds and at frequencies up to 120 Mc/sec. The observed pattern of absorption lines agree well with that calculated for an $s$-electron coupled to a ${\mathrm{N}}^{14}$ (spin 1) nucleus. The zero-field splitting is 54.7±0.5 Mc/sec.