Ion-molecule calculation of the abundance ratio of CCD to CCH in dense interstellar clouds.


Laboratory measurements and calculations have been performed to determine the abundance ratio of the deuterated ethynyl radical (CCD) to the normal radical (CCH) which can be achieved in dense interstellar clouds via isotopic fractionation in the C2H2+ (HD) = C2HD+ (H2) system of reactions. According to this limited treatment, the CCD/CCH abundance ratio… (More)


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