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Methyl internal rotation is frequently resolved in the
rotational spectrum of the molecule. Transition frequencies
up to 40 GHz were reported by
(1) M. Tyblewski, T.-K. Ha, and A. Bauder,
1986, J. Mol. Spectrosc. 115, 353.
The data were fit with erham.
Please note that erham sometimes swaps the Kc
labels for nominally prolate paired E symmetry levels.
Several typographical and related errors were corrected
in the line list. The frequency range and the number of
transitions are somewhat small. Nevertheless, the
quantum numbers cover a sizeable range.
The calculated spectrum was truncated at J = 40 and
at 200 GHz. Caution is advised for transition frequencies
above 80 GHz or with calculated uncertainties
exceeding 0.1 MHz.
The state number 0 signals the A symmetry
component and 1 the E symmetry component.
The dipole moment components were determined in (1).
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