Abstract
The microwave spectrum of trans-crotonitrile, CH 3CHCHCN, was measured in the frequency region from 8.2 to 37 Geps. The R-branches for the a-type and the R- and Q-branches for the b-type have been assigned. The low J transitions, 1 → 2( K −1 = 1), of the a-type and all of the b-type transitions are split into the A-level and the E-level by the internal rotation of the methyl group. The apparent rotational constants for the A- and E-levels were obtained from the pseudo-rigid rotor approximation as A A = 38 053.31 Mcps, A E = 38 042.73 mcps, B = 2297.07 Mcps, and C = 2195.16 Mcps. The rotational constants of B and C agree with those obtained by Laurie within the experimental errors. The barrier height of the hindering rotation of the methyl group is determined to be 1940 ± 10 cal/mole. The value of the a component of the dipole moment is 4.35 ± 0.06 D.
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