High-resolution infrared study of collisionally cooled trans-1,2-Dichloroethylene (cas 156-60-5)

Add time:09/28/2019    Source:infona.pl

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 0.00190cm −1 in the 800–1000cm −1 spectral region. The rotational structure of the out-of-plane CH flapping fundamental has been analyzed for the isotopic analogues 35 Cl 2 and 35 Cl 37 Cl using the Watson A-reduced Hamiltonian model and I r -representation. A ground-state combination difference analysis for the 35 Cl 37 Cl 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 35 Cl 37 Cl relative to the 35 Cl 2 band origin is now consistent with the Rayleigh rule.

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