Abstract
A recently constructed long-path enclosive flow cooling apparatus is employed to obtain the Fourier transform gas-phase infrared absorption spectrum of natural isotopic trans-1,2-dichloroethylene with a resolution of 0.00190 cm −1 in the 800–1000 cm −1 spectral region. The rotational structure of the out-of-plane CH flapping fundamental has been analyzed for the isotopic analogues 35Cl 2 and 35Cl 37Cl using the Watson A-reduced Hamiltonian model and I r -representation. A ground-state combination difference analysis for the 35Cl 37Cl isotopomer based on 1402 assigned transitions belonging to the ν 6 band yields a band origin of 897.94493(10) cm −1 and values for the ground-state rotational constants: A 0 = 1.7466454(44) cm −1, B 0 = 0.05019643(82) cm −1 and C 0 = 0.04877977(82) cm −1 together with quartic centrifugal distortion constants. The red-shift of 0.00444(10) cm −1 observed for the ν 6 band origin of 35Cl 37Cl relative to the 35Cl 2 band origin is now consistent with the Rayleigh rule.
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