The rotational transition frequencies were reported by
(1) G. R. Adande, D. T. Halfen, and L. M. Ziurys, 2012, J. Mol. Spectrosc. 278, 35.
At low to moderate quantum numbers, the hyperfine splitting is larger or about as large as the fine structure splitting. Therefore, the coupling scheme employed was: S + I = G, N + G = F; in contrast to (1), where the conventional coupling scheme was used.
Predictions may be reliable up to about 200 GHz.
The dipole moment was reported by
(3) T. C. Steimle, A. J. Marr, and D. M. Goodridge, 1997, J. Chem. Phys. 107, 10406.