a Look at a Series of Alkyl and Perfluoroalkyl Bromides and Chlorides

Physics

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Microwave

Scientific paper

The pure rotational spectrum for bromoperfluoroethane between 8.0 and 14.0 GHz and chloroperfluoroethane between 8.0 and 16.0 GHz has been measured on a chirped pulse Fourier transform microwave spectrometer for the first time. A total of 839 transitions for the bromoperfluoroethane, which includes the 79Br, 81Br parent isotopologues and the four 13C's, have been assigned quantum numbers. 496 transitions were observed for chloroperfluoroethane, which includes the 35Cl and 37Cl species. Only the trans conformers were observed for which the rotational constants are reported. Nuclear electric quadrapole coupling constants have been determined and reported. Also, two dipole forbidden/quadrapole allowed Δ J = 2 transitions were observed in only the bromoperfluoroethane spectra. No forbidden transitions were observed in the chloroperfluoroethane.

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