The experimental transitions frequencies have been reported in
(1) S. Thorwirth, H. S. P. Müller, and G. Winnewisser, 2001, Phys. Chem. Chem. Phys. 3, 1236.
The transition frequencies were recorded in the 2 mm region. Therefore, predictions into the submillimeter region should be viewed with some caution. The ¹⁴N hyperfine splitting may be resolved in the ISM/CSM at low values of J. However, the intensities of these lines are probably much too low. NOTE: The partition function does NOT take into account the hyperfine splitting and no vibrational contributions !
The dipole moment was assumed to be the same as for the main isotopomer, see e051501.cat.