Abstract
The microwave spectrum of ethyl bromide has been investigated and accurate values for the rotational constants B and C and the asymmetry parameter b have been obtained. For C2H5Br79 B=3804.5 Mc, C=3522.5 Mc, b= —0.00487949 and for C2H5Br81 B=3781.5 Mc, C=3503.0 Mc, and b= —0.00522977. The following model reproduces these constants to within 2 Mc: C–C 1.5495 A, C–H 1.110 A, C–Br 1.9400 A ≰ C –C–H 110°00′, ≰C–C–Br 110°30′. Analysis of the quadrupole hyperfine structure indicates that eqQ along the C–Br bond axis is 537.5 Mc for C2H5Br79 and 450.9 Mc for C2H5Br81. Two transitions have not been able to be fitted by first-order or second-order nondegenerate quadrupole theory. The torsional frequency is estimated to be 202 cm—1 and the barrier height is 2.80 kcal/mole.
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