CDMS

The experimental laboratory frequencies and the dipole moment were reported in
(1) M. Hahn, H.-K. Bodenseh, and M. Ferner, 2004, J. Mol. Spectrosc. 223, 138.
The ¹⁴N hyperfine splitting may be resolvable at lower frequencies or at lower quantum numbers. Therefore, a separate calculation with hyperfine structure is available up to 188GHz and with J up to 5. In the general entry, the spin-multiplicity of the ¹⁴N nucleus was not considered in the calculation of the partition function. The partition function values have to be multiplied with g(¹⁴N)=3 when hyperfine structure is considered.
The dataset is not particularly large and extends to 40GHz only. Therefore, transition frequencies with predicted uncertainties of more than 1MHz should be viewed with great caution. There is a fairly sizeable number of transitions in the 3mm region that are predicted reliably. However, their fraction decreases fast at higher frequencies.