The experimental data has been taken from
(1) H. S. P. Müller, A. Coutens, A. Walters, J.-U. Grabow, and S. Schlemmer, 2011, J. Mol. Spectrosc., 267, 100.
¹⁴N hyperfine splitting has been resolved for some transitions at MW frequencies, but are unlikely to be resolved in astronomical observations. Nevertheless, a separate hyperfine calculation is provided up to J" = 10 and up to 115 GHz. NOTE: The partition function does not take into account hyperfine splitting ! The partition function values have to be multiplied with 3 if hyperfine structure is taken into account !
Predictions are probably reliable throughout; those with uncertainties larger than 1 MHz should be viewed with caution.
The dipole moment components were determined in (1).