The experimental lines are from
(1) M. C. McCarthy, E. S. Levine, A. J. Apponi, and P. Thaddeus, 2000, J. Mol. Spectrosc. 203, 75.
The ¹⁴N hyperfine splitting was resolved in the laboratory. It may be resolved in the ISM for low values of J. The hyperfine pattern is expected to be very similar to that of the main isotopomer, see e099501.cat and c099501.cat. NOTE: As for the main isotopolog, the partition function does not take into account the hyperfine splitting and no vibrational contributions ! The partition function has to be muliplied by g(¹⁴N) = 3 when ¹⁴N hyperfine splitting is considered ! Information on vibrational contributions to the partition function of the main isotopolog are also available.
The dipole moment was assumed to be the same as that of the main isotopolog, see e099501.cat.