Abstract
We have observed DC 3 N and HC 3 N in a number of cold dust clouds in order to derive the degree of deuterium fractionation. We find that the ratio of DC 3 N to HC 3 N is large, at about 0.05 or more, and discuss the implications of this result for the synthesis of cyanoacetylene. The observations are most readily interpreted if the deuteration of HC 3 N is linked to that of cyclic C 3 H 2 , witch is also observed to exhibit a large degree of deuterium fractionation. HC 3 N deuteration levels comparable with those we observed are found to be just compatible with the mechanism suggested by Howe & Millar, but with adjusted rate coefficients. Freeze-out on to grain surfaces is also considered, but produces widespread deuterium enhancement in many species, contrary to observed levels
Published Version
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