Abstract
The microwave spectrum of 2-chloro-1,1,1,2-tetrafluoroethane has been analyzed in the frequency region 12–52 GHz using waveguide Fourier transform and Stark modulation microwave spectrometers. The spectra of35Cl and37Cl isotopomers and of the two lowest excited states of the CF3torsional vibration of35Cl species have been measured up toJ= 58. Chlorine nuclear quadrupole coupling constants have been determined from a first-order analysis of the observed hyperfine components. Rotational constants and quartic centrifugal distortion constants have been determined from the calculated central frequencies. Relative intensity measurements give a value of 4.0 ± 1.8 kcal mole−1for the barrier to internal rotation of CF3group.
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