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The barrier to the internal rotation of the two methyl-tops has been calculated from quartet splittings of six rotational transitions with J values up to five. Using the data of the r 0 -structure, one obtains s= (4 V 3 )/ (9 F) = 43.4. If s and the direction cosine λ α  are fitted simultaneously to the multiplet splittings, which leads to an angle of about 2° between the S—C-bond and the axis of internal rotation, one obtains s=43.78. A brief sketch of the method used to diagonalize the complex HAMILTONian matrix is given.

Zum Hinderungspotential der internen Rotation der Methylgruppen in Dimethyldisulfid