The experimental microwave and lower millimeter wave lines are from
(1) E. R. Alonso, A. Insausti, L. Kolesniková, I. León, B. A. McGuire, C. N. Shingledecker, M. Agúndez, J. Cernicharo, V. M. Rivilla, C. Cabezas, I. Jiménez-Serra, J. Martín-Pintado, and J.-C. Guillemin, 2024, Astrophys. J. 976, Art. No. 95.
The calculations were truncated at J = 50. Transitions with calculated uncertainties exceeding 0.1 MHz should be viwed with caution.
The ¹⁴N hyperfine splitting may be resolved for lower J transitions. Therefore, a separate hyperfine calculation up to J = 10 and up to 51 GHz is provided. The ¹⁴N spin multiplicity of 3 was considered in the calculation of the partition function !
The dipole moment is from a quantum chemical calculation in (1).