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This entry is a combined CDMS and JPL entry.
The latest combined fit has been reported by
(1) H. S. P. Müller; B. J. Drouin, and J. C. Pearson,
2009, Astron. Astrophys. 506, 1487.
This work provides new data between 339 and 1193 GHz.
Additional data were taken from
(2) J. C. Pearson and H. S. P. Müller,
1996, Astrophys. J. 471, 1067;
and from
(3) J. Demaison, A. Dubrulle, and D. Boucher,
1979, J. Mol. Spectrosc. 76, 1.
The purely K-dependent terms A and
DK were assumed to agree with
those of the main isotopolog, see e041505.cat.
The predictions are probably reliable throughout.
14N hyperfine splitting may be resolvable
at low values of J and possibly at the highest
K. Therefore, predictions with
hyperfine splitting have been provided up to
J" = 11
(230 GHz; July 2016); along with appropriate
partition function values. Note:
Vibrational contributions have not been
considered in the calculation of the partition
function yet. Rough estimates may be obtained
by scaling the respective ground state value
with the ratio from the main isotopolog.
At low temperatures, it may be necessary to discern between
A-13CH3CN and
E-13CH3CN.
The A state levels are described by
K = 3n, those of E state
by K = 3n ± 1.
The nuclear spin-weight ratio is 2 : 1 for
A-13CH3CN with
K > 0 and all other states, respectively.
The JK = 11
level is the lowest E state level.
It is 5.5715 cm–1 above ground.
The dipole moment was assumed to agree with
that of the main isotopolog, see e041505.cat.
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