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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) A. Dubrulle, J. Demaison, J. Burie, and D. Boucher,
1980, Z. Naturforsch. 35a, 471; from
(3) A. V. Burenin, E. N. Karyakin, A. F. Krupnov,
S. M. Shapin, and A. N. Val'dov,
1981, J. Mol. Spectrosc. 85, 1;
and from
(4) J.-U. Grabow and W. Stahl,
1990, Z. Naturforsch. 45a, 1043.
Predictions beyond J = 60 should be
viewed with some caution.
The 13C nuclear spin-rotation splitting may be
resolved for the J = 1 – 0 transition;
the splitting is about 5.0 kHz for this transition
with an intensity ratio of 1 : 2 (4).
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
(5) K. Tanaka, T. Tanaka, and I. Suzuki
1985, J. Chem. Phys. 82, 2835.
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