Abstract
Overtone Raman spectra of dimethylamine (DMA) are analyzed yielding accurate torsional potential parameters. Neglecting the inversion motion of the amino-hydrogen in DMA the group G 18 is the proper molecular symmetry group to analyze the measured torsional Raman spectrum. The character table of G 18 for this basically pyramidal molecule has been derived and is reported here explicitly. The torsional potential parameters are fitted with the introduction of additional terms in the Hamiltonian odd in α i , α i being the torsional angle of top i. The mutual top-top interaction terms yield a significant distortion of the torsional potential surface.
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