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The experimental lines are from
(1) A. G. Maki and D. R. Johnson,
1973, J. Mol. Spectrosc. 47, 226; from
(2) H. Dreizler, U. Andresen, J.-U. Grabow, and D. H. Sutter,
1998, Z. Naturforsch. 53a, 887;
and from
(3) K. Kubo, T. Furuya, and S. Saito,
2003, J. Mol. Spectrosc. 222, 255.
Predictions should be reliable up to
Jmax = 99.
The 13C nuclear spin-rotation splitting may be
resolved for the J = 1 – 0 transition;
the splitting is about 4.9 kHz for this transition
with an intensity ratio of 1 : 2 (2).
This splitting is unlikely to be resolved for higher J
because it is only about 3.4 kHz
between the strong hfs components. The 13C spin
multiplicity of 2 was not considered in the calculation
of the partition function !
The dipole moment was derived from
(4) K. Tanaka, T. Tanaka, and I. Suzuki
1985, J. Chem. Phys. 82, 2835.
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