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- W2038295086 abstract "Aims. Following the recent detection of C6H − in the laboratory and in space we have succeeded in studying the microwave spectrum of C4H − . We report here the first detection in space of this negative ion. Methods. We have observed in the envelope of the carbon star IRC +10216 five lines corresponding to the J = 9−8, 11−10, 12−11, 14−13 and 15−14 rotational transitions of C4H − .T he C 4H − lines have a cusped shape, denoting that this ion is formed in the outer part of the envelope, like its neutral counterpart C4H. Results. The abundance of C4H − in IRC+10216 is 1/6 of the abundance of C6H − and 1/4200 of that of C4H. Conclusions. The detection of C4H − , after that of C6H − , confirms the theoretical prediction that C-chain anions are abundant in interstellar clouds and yields a first measurement of the electron radiative attachment rates." @default.
- W2038295086 created "2016-06-24" @default.
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- W2038295086 date "2007-01-01" @default.
- W2038295086 modified "2023-10-11" @default.
- W2038295086 title "Astronomical detection of C 4 H , the second interstellar anion" @default.
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