The first detection is reported of the radical C3N in interstellar sources, at the centers of the two dark clouds TMC 1 and TMC 2. The very small line widths observed for this low-order transition (N equals 3-2) allow a partial resolution of the hyperfine structure and a tentative estimate of this radical's hyperfine constants. The C3N/HC3N abundance ratio observed in the two clouds is similar to that in IRC plus 10216, but much larger than the upper limit derived for Orion A and Sagittarius B2.
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Friberg et al. (1980) studied this question.