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An analysis of the rotational spectra in torsional excited states is given for propane, dimethylsilane and dimethylsulfide. The analysis is based on the Hamiltonian for the quasi-rigid model. The potential barrier V 3 and one additional potential coefficient V′ 12 were determined. The splitting within the multipletts could be reproduced, but not the spacing between them.
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Trinkaus et al. (1973) studied this question.
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