Magnetic Hyperfine Structure of the J=3, K=2 Line of N14H3

The magnetic hyperfine structure of the J =3, K =2 line in the inversion spectrum of N 14 H 3 has been studied by means of a molecular beam maser spectrometer. The results are analyzed by assuming ( I · J ) type inter-actions of the protons and nitrogen spins, and by taking the coupling scheme of angular momenta F 2 = I + J , F = I N + F 2 . The observed hyperfine structure shows two satellite lines on each side of the central line, corresponding to the transitions with Δ F 2 =0, Δ F =±1, and Δ F 2 = Δ F =±1. From the frequency measurements of these satellite lines the coupling constants of the ( I · J ) interactions are determined to be -17.67±0.3 kc for the protons, and 6.73±0.04 kc for the nitrogen nucleus. The theory predicts that the hyperfine components with Δ F 2 =0, Δ F =±1 consist of two groups of lines separated by abut 7 kc, while the experiments show that the separation is smaller than 4.5±0.5 kc. Effects of other types of interactions are taken into consideraction, but they give no appropriate interpretation of the discrepancy.