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Isocyanic acid is a quasi-linear molecule.
The lines were taken from
(1) S. G. Kukolich, A. C. Nelson, and B. S. Yamanashi,
1971, J. Am. Chem. Soc. 93, 6769;
from
(2) W. H. Hocking, M. C. L. Gerry, and G. Winnewisser,
1975, Can. J. Phys. 53, 1869;
from
(3) M. Niedenhoff, K. M. T. Yamada, S. P. Belov,
and G. Winnewisser,
1995, J. Mol. Spectrosc. 174, 151;
and from
(4) A. V. Lapinov, G. Yu. Golubiatnikov, V. N. Markov,
and A. Guarnieri,
2007, Astron. Lett. 33, 121.
The FIR transitions from (3) (with uncertainties of
3 MHz or more) have not been merged.
The predictions should be reliable throughout.
14N hyperfine splitting may be resolved
for low values of J. Therefore, a
separate hyperfine calculation is provided for
a-type transitions with J' ≤ 7
and Ka ≤ 1.
NOTE: The partition function
does not take into account the spin multiplicity
gI = 3 of the 14N
nucleus !
Earlier Stark measurements have been reinterpreted in (2).
This interpretation suggests a Ka dependent
decrease in the a-dipole moment component and a
corresponding increase in the a-component. Supposing
one K distortion correction to be necessary only
for each component, these were determined, and a value of
1.58 D was estimated for Ka = 0.
The rather smooth increase of the b-dipole moment component
calculated from each individual mJ component
for increasing J values may indicate a non-negligible
J distortion correction to the dipole moment components.
Such correction, however, was omitted because no value is available.
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