Abstract
From the A-E doubling measured in several rotational transitions, the A-E splittings for J = 0 have been accurately determined in the ground and various torsionally excited states belonging to the methyl and to the two skeletal torsions. The inversion of the sequence of A and E type levels with respect to the ground state, in various excited states of the two skeletal torsions, proves their mixing with the first excited state of the methyl torsion. The observed splittings of the ground and 5 excited states have been accounted for by two-dimensional flexible models with simple potential functions. The variations of the rotational constants upon torsional excitation have been reproduced by allowing a partial structural relaxation to take place along with the torsional motions.
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