Show pageOld revisionsBacklinksBack to top This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. ===== On the Cyanobutadiynylide Ion, C5N–, in Space ===== The cyanobutadiynylide ion has been detected toward the carbon rich star IRC +10216 in 12 rotational transitions from //J// = 8 – 7 to 40 – 39. Most of these occur in the 3 mm region and have been detected with the IRAM 30 m telescope; one additional transition was detected with the Effelsberg 100 m telescope at 13.5 mm:\\ J. Cernicharo, M. Guélin, M. Agúndez, M. C. McCarthy, and P. Thaddeus,\\ **[[https://doi.org/10.1086/595583|Detection of C<sub>5</sub>N<sup>–</sup> and Vibrationally Excited C<sub>6</sub>H in IRC +10216]]**\\ //Astrophys. J.// **688**, (2008), L83–L86.\\ No laboratory data are available for this molecule at present. The assignments were based on high level //ab initio// calculations by\\ P. Botschwina and R. Oswald,\\ **[[https://doi.org/10.1063/1.2949093|Carbon Chains of Type C<sub>2//n//+1</sub>N<sup>–</sup> (//n// = 2 – 6): A Theoretical Study of Potential Interstellar Anions]]**\\ //J. Chem. Phys.// **129**, Art. No. 044305 (2008).\\ Its abundance in that source in combination with those of related molecules leave little doubt about the assignments.\\ An additional line, U33332.3, reported by\\ K. Kawaguchi, Y. Kasai, S.-I. Ishikawa, and N. Kaifu,\\ **[[https://ui.adsabs.harvard.edu/abs/1995PASJ...47..853K|A Spectral-Line Survey Observation of IRC +10216 between 28 and 50 GHz]]**\\ //Publ. Astron. Soc. Japan// **47**, 853–876 (1995),\\ is, at least in part, due to C<sub>5</sub>N<sup>–</sup>.\\ This anion is isolelectronic to C<sub>6</sub>H<sup>–</sup> which was the first molecular anion to be detected in space. In addition, it is a sibling of the recently detected C<sub>3</sub>N<sup>–</sup>.\\ Meanwhile,\\ J. Cernicharo, N. Marcelino, J. R. Pardo, M. Agúndez, B. Tercero, P. de Vicente, C. Cabezas, and C. Bermúdez\\ reported on\\ **[[https://doi.org/10.1051/0004-6361/202039231|Interstellar nitrile anions: Detection of C<sub>3</sub>N<sup>–</sup> and C<sub>5</sub>N<sup>–</sup> in TMC-1]]**\\ //Astron. Astrophys.// **641**, Art. No. L9 (2020).\\ ---- Contributor(s): H. S. P. Müller; 10, 2008; 09, 2020 ---- molecules/ism/c5n-minus.txt Last modified: 2020/09/23 17:06by mueller