Abstract
The rotational spectra of 1,1-dichloroethane in the ground state of the CH 3CH 35 Cl 2 , CH 3CH 35 Cl 37 Cl and CH 3CH 37 Cl 2 isotopomers and in four low frequency excited states of the main species have been investigated in the range 6–250 GHz. Measurements have been carried out using molecular beam and waveguide Fourier transform microwave spectrometers as well as Stark and source modulation spectrometers. Accurate rotational and centrifugal distortion constants have been obtained. The complete Cl-nuclear quadrupole coupling tensors have been determined from the analysis of the resolved hyperfine structure for the three observed isotopomers. From the small A–E splittings observed in the first torsional excited state, the barrier to internal rotation of the methyl group has been determined to be 4.260(9) kcal mol −1.
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