Evidence of Tilt of the Methyl Top Axis in the r,-structure of Dimethyl Selenide

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Abstract
The complete rs-structure of dimethyl selenide has been determined by using suitably chosen changes in principal moments of inertia of a number of isotopic species. The tilt of the methyl top axis with respect to the C -Se bond, as determined by the analysis of the internal rotation fine structure of the rotational transitions is also evidenced in the rs-structure. The center of mass condition has been used.