Microwave Spectrum of Ethyl Iodide, I

Abstract

Microwave spectrum of ethyl iodide molecule C₂H₅I was studied. The obtained rotational constants are: A=29106.2±0.5 Mc/sec, B=2979.2±0.1 Mc/sec and C=2797.1±0.1 Mc/sec, which lead to the structure as d_CI=2.139±0.005 Å and ∠CCI=112°10′±20′ with the assumption of d_CC=1.54 Å. The calculation of the second order quadrupole effects for slightly asymmetric molecule with a plane of symmetry gave the asymmetry parameter η=(q_bb−q_cc)⁄q_aa of 0.205±0.005 and ξ=q_ab⁄q_aa of −0.57±0.05 as well as the coupling constant eqQ of −1771±10 Mc/sec along C–I bond. The components of the electric dipole moment were determined to be μ_a=1.75±0.05 D and μ_b=0.25±0.1 D. Centrifugal constants were obtained as D_K=0.36±0.05 Mc/sec, D_JK=−0.151±0.005 Mc/sec and D_J<0.05 Mc/sec.