Abstract
The microwave absorption spectrum of methylamine- d 1 has been investigated in the range from 20 to 110 GHz. One hundred twenty-two transitions in the ground vibrational state are least-squares-analyzed with 21 molecular parameters according to a group-theoretical formalism modified from the method developed previously for CH 3NH 2. Pure torsional and wagging energy differences are derived from the parameters obtained, and a classical tunneling path during the inversion motion of the unsymmetrical-NHD amino group is deduced by combining an assumed parametrization for the tunneling path with traditional methods for treating the internal rotation problem.
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