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The rotational transition frequencies were summarized
in
(1) N. C. Craig, P. Groner, A. R. Conrad, R. Gurusinghe,
and M. J. Tubergen,
2016, J. Mol. Spectrosc. 328, 1.
Besides limited, but accurate new microwave data,
transition frequencies were taken from
(2) E. Hirota,
1966, J. Chem. Phys. 45, 1984;
from
(3) J. C. Pearson, K. V. L. N. Sastry, E. Herbst, and
F. C. De Lucia,
1994, J. Mol. Spectrosc. 166, 120;
and from
(4) G. Wlodarczak, J. Demaison, N. Heineking, and A. G.
Császár,
1994, J. Mol. Spectrosc. 167, 239.
The molecule displays commonly splitting caused by methyl
internal rotation; state number 0 signals the A
symmetry component, 1 the E symmetry component.
The quality of the predictions should be sufficient for
astronomical observations. Predictions with calculated
uncertainties exceeding 0.3 MHz should be viewed
with caution. Some blended lines were erroneously not merged.
In addition, a small number of measured transitions are
not in the catalog.
The dipole moment was determined by
(5) D. R. Lide Jr., and D. E. Mann,
1957, J. Chem. Phys. 27, 868.
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