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The measurements were taken from
(1) H. Habara and S. Yamamoto,
2003, J. Mol. Spectrosc. 219, 30.
The parameter set differs considerably from that in (1);
several parameters were evaluated from a quantum-chemical
calculation or from other derivations by
(2) H. S. P. Müller, 2022, unpublished.
Only the N = 1 – 0 transition was observed
in the laboratory so far. Therefore, only transitions
with Ka = 0 are available;
they may be quite fine up to N = 3 – 2,
the two next ones should be viewed with greater caution.
The partition function takes into account higher
Ka values as far as possible at present.
The total dipole moment (1.02) is from an ab initio
calculation from
(3) C. Ochsenfeld, R. I. Kaiser, Y. T. Lee, and M. Head-Gordon,
1999, J. Chem. Phys. 110, 9982.
An a dipole component of 0.4 D was communicated
to the authors of a HSC article
(4) H. Habara and S. Yamamoto,
2000, J. Chem. Phys. 112, 10905.
In addition, there should be a b dipole component
of about 0.9 D.
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