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The J" = 0 transition was taken from
astronomical observations by
(1) F. F. S. van der Tak, H. S. P. Müller,
M. E. Harding, and J. Gauss,
2009, Astron. Astrophys. 507, 347;
the J" = 1 transition was taken
from laboratory measurements by
(2) R. A. Creswell, E. F. Pearson, M. Winnewisser, and
G. Winnewisser,
1976, Z. Naturforsch. 31a, 221.
Also employed in the fit were rovibrational transitions
from
(3) A. G. Maki and G. Ch. Mellau,
2001, J. Mol. Spectrosc. 206, 47.
Predictions above 500 GHz should be viewed with caution.
At low J, the 14N, H, and 13C
hyperfine splitting has been resolved in part in astronomical
observations. Therefore, a separate
hyperfine calculation up to J" = 2 is provided
along with
partition function values.
May 2013: The entry was
reevaluated taking into consideration that uncertainties in (2)
were 3σ values whereas we use 1σvalues.
Date and version number of the entry have been retained.
The dipole moment was assumed to agree with that of HNC,
see e027502.cat.
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