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The observed lines are from
(1) W. Chen, J.-U. Grabow, M. J. Travers, M. R. Munrow,
S. E. Novick,M. C. McCarthy, and P. Thaddeus,
1998, J. Mol. Spectrosc. 192, 1.
The purely K-dependent parameters (A and
DK), needed to obtain reasonable intensities,
were taken from CH3CN;
(2) R. Antilla, V.-M. Hornemann, M. Koivusaari, and R. Paso,
1993, J. Mol. Spectrosc., 157, 198.
Predictions have been truncated at K = 6.
Nevertheless, predictions at higher J and
K should be viewed with great caution.
Quadrupole splitting due to the 14N nucleus may
be resolvable for low J.
Therefore, a separate
hyperfine calculation is provided with J' up to 12 and
Ka up to 3 along with
partition function values.
Please note: the
entry has been reevaluated April 2013 to resolve minor
issues.
The dipole moment is an estimate.
At low temperatures, it may be necessary to discern between
A-CH3C9N and
E-CH3C9N. The A states
are described by K = 3n, the E
states by K = 3n ± 1.
The nuclear spin-weight ratio is 2 : 1 for
A-CH3C9N with
K > 0 and all other states, respectively.
The JK = 11 state
is the lowest E state. It is
5.2805 cm–1 above ground.
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