Fourier transform Microwave data were added to the astronomical data, on which the first entry of Oct. 2019 was based. The FTMW data were reported by
(1) P. B. Changala, N. Genossar-Dan, J. H. Baraban, M. C. McCarthy, 2024, J. Mol. Spectrosc. 401, Art. No. 111904.
The astronomical lines were reported by
(1) J. Cernicharo, C. Cabezas, J. R. Pardo, M. Agúndez, C. Bermúdez, L. Velilla-Prieto, F. Tercero, J. A. López-Pérez, J. D. Gallego, J. P. Fonfría, G. Quintana-Lacaci, M. Guélin, and Y. Endo 2019, Astron. Astrophys. 630, Art. No. L2.
Hyperfine structure (HFS) splitting caused by the ¹⁴N nucleus may be resolvable for low N transitions. Therefore, a separate hyperfine calculation is provided for J ≤ 18 below 50 GHz and with somewhat lowered intensity cut-offs. NOTE: The partition function takes now into account the spin multiplicity of the ¹⁴N nucleus !
The calculated transition frequencies should be quite reliable up to 180 or 200 GHz.
The dipole moment was taken from a quantum chemical calculation in (2).