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The experimental data were taken from
(1) K. Bolton and R. D. Brown,
1974, Austr. J. Phys. 27, 143;
from
(2) L. Nygaard, J. T. Nielsen, J. Kirchheimer, G. Maltesen,
N. Rastrup-Andersen, and G. O. Sørensen,
1969, J. Mol. Struct. 3, 491;
and from
(3) G. Wlodarczak, L. Martinache, J. Demaison, B. P. van Eijck,
1988, J. Mol. Spectrosc. 127, 200.
The parameter set is slightly more extensive than that in (3).
Two parameters were estimated from furan.
14N hyperfine structure was deemed to be irrelevant
for astronomical observations and were omitted.
Two lines from (3) were omitted from the fit.
The predictions may well be sufficient for all needs of
astronomers. Predictions with uncertainties larger than
0.5 MHz should be viewed with caution.
Spin-statistics matter for the intensities.
The nuclear spin-weight ratio is 5 : 3
for ortho-c-C4H4NH
: para-c-C4H4NH.
The ortho states are described by
Ka even, the para
states by Ka odd.
The dipole moment was taken from (2).
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