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Determination of a High Potential Barrier Hindering Internal Rotation from the Analysis of the Ground State Spectrum : The Case of Ethyl Cyanide

D. Boucher, A. Dubrulle, and J. Demaison
Laboratoire do Spectroscopic Hertzienne, Laboratoire associe au CNRS n° 249, University de Lille I
H. Dreizler
Abteilung Chemische Physik im Institut für physikalische Chemie der Universität Kiel
Z. Naturforsch. 3oa, 1136-1141 (1980);

[received August 12 1980]

The ground state rotational spectrum of ethyl cyanide has been reinvestigated between 8 and 250 GHz. The barrier potential V3 is calculated from 11 high «/, ground state transitions which were found split into doublets. V3 is 3007 cal/mole, assuming 7 a = 3.167uA 2 and £ ( i, a ) = 48.65°. The splittings of the K-doublet transitious have also been analyzed.

Introduction