Rovibrational and, as far as published, rotational data involving
states v_{2} = 0 to 3 as well as v_{3} = 1
and v_{1} = 1 were used in the fit.
Data for v = 0 and v_{2} = 1, including
directltype transitions up to J = 35 for
v_{2} = 1, were reported in
(1) U. Fuchs, S. Brünken, G. W. Fuchs, S. Thorwirth, V.
Ahrens, F. Lewen, S. Urban, T. Giesen, and G. Winnewisser,
2004, Z. Naturforsch. 59a, 861.
Additional v = 0 data come from
(2) G. Cazzoli and C. Puzzarini,
2005, J. Mol. Spectrosc. 233, 280;
and from
(3) F. Maiwald, F. Lewen, V. Ahrens, M. Beaky, R. Gendriesch,
A. N. Koroliev, A. A. Negirev, D. G. Paveljev, B. Vohwinkel, and G. Winnewisser
2000, J. Mol. Spectrosc. 202, 166.
Further directltype transitions 6 ≤ J ≤ 15
were published in
(4) M. Winnewisser and J. Vogt,
1978, Z. Naturforsch. 33a, 1323.
The 2nd entry also employs v_{2} = 2 and 3
rotational data from
(5) J. Preusser and A. G. Maki,
1993, J. Mol. Spectrosc. 162, 484.
The fit also takes into account the very extensive infrared data
between the various vibrational states from
(6) A. G. Maki, G. C. Mellau, S. Klee, M. Winnewisser, and W. Quapp,
2000, J. Mol. Spectrosc. 202, 67.
The partition function is essentially converged at 300 K
and probably still good up to about 500 K. The rotational
part is well converged up to 1000 K. Even though no pure
rotational transition frequencies have been published, predictions
with calculated uncertainties below 6 THz should be viewed
only with slight caution. Greater caution is advised at higher
frequencies.
The dipole moment was assumed to be the same as for the main
isotopic species; see e027509.cat.
Note:
the spin multiplicity g_{I} of 3 for
the ^{14}N nucleus has been considered
in the calculation of the partition function and the
upper state degeneracy g_{up}.
The partition function takes into account all vibrational states
used in the fit.
