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The experimental lines are from
(1) N. W. Larsen, and B. P. Winnewisser,
1974, Z. Naturforsch. 29a, 1213; from
(2) A. Dubrulle, J. Demaison, J. Burie, and D. Boucher,
1980, Z. Naturforsch. 35a, 471; from
(3) J. P. M. de Freede, M. P. W. Gillis, and H. A. Dijkerman,
1988, J. Mol. Spectrosc. 128, 509;
and from
(3) F. J. Lovas and R. D. Suenram,
1987, J. Chem. Phys. 87, 2010.
Predictions beyond J = 50 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 5.1 kHz for this transition
with an intensity ratio of 1 : 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 is from
(4) K. Tanaka, T. Tanaka, and I. Suzuki
1985, J. Chem. Phys. 82, 2835.
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