The spectroscopic parameters and the experimental transition frequencies were published in
(1) H. S. P. Müller, A. Belloche, K. M. Menten, C. Comito, and P. Schilke, 2008, J. Mol. Spectrosc. 251 319.
Besides from this work, the data originate from
(2) M. C. L. Gerry and G. Winnewisser, 1973, J. Mol. Spectrosc. 48, 1;
(3) J. Demaison, A. Bouchy, G. Roussy, and J. Barriol, 1973, Compt. Rend. 276C, 967;
(4) M. Stolze and D. H. Sutter, 1985, Z. Naturforsch. 40a, 998;
(5) G. Cazzoli and Z. Kisiel, 1988, J. Mol. Spectrosc. 130, 303;
(6) J. Demaison, J. Cosléou, R. Bocquet, and A. G. Lesarri, 1994, J. Mol. Spectrosc. 167, 400;
(7) O. I. Baskakov, S. F. Dyubko, V. V. Ilyushin, M. N. Efimenko, V. A. Efremov, S. V. Podnos, and E. A. Alekseev, 1996, J. Mol. Spectrosc. 179, 94;
and from
(8) J. M. Colmont, G. Wlodarczak, D. Priem, H. S. P. Müller, E. H. Tien, R. J. Richards, and M. C. L. Gerry, 1997, J. Mol. Spectrosc. 181, 330.
Calculations with uncertainties exceeding 0.2 MHz should be viewed with increasing caution.
¹⁴N hyperfine splitting may be resolved for low values of J. Therefore, a separate hyperfine calculation is provided for J' ≤ 15 and frequencies below 120 GHz.
NOTE: The partition function does take into account the spin multiplicity g_I = 3 of the ¹⁴N nucleus ! Furthermore, energy levels up to J = 170 and K_a = 50 have been considered in the calculation of the partition function. This is sufficient up to 300 K. At higher temperatures classical extrapolations are recommended. The partition function also includes contributions from low-lying vibrational modes. Partition function values for only the ground vibrational state are given in parentheses.
The dipole moment was taken from (4).