===== On the Detection of the Hexatriynylide Ion, C6H–, in Space =====

The hexatriynylide ion is the first anion that has been detected in space by radioastronomical means in 1995.\\
M. C. McCarthy, C. A. Gottlieb, H. Gupta, and P. Thaddeus,\\
**[[https://doi.org/10.1086/510238|Laboratory and Astronomical Identification of the Negative Molecular Ion C<sub>6</sub>H<sup>–</sup>]]**\\
//Astrophys. J.// **652**, L141–L144 (2006)\\
reported microwave and millimeter-wave transitions of the molecule and the detection of two rotational transitions of this ion (//J// = 4 – 3 and 5 – 4) in TMC-1.\\
In addition, they identified this molecule as the carrier of B1377, a molecular species of unknown identity at the time the report was published and with a rotational //B// value of 1377 MHz. These lines have been found and attributed to an unknown species in\\
**[[http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1995PASJ...47..853K|A Spectral-Line Survey Observation of IRC +10216 between 28 and 50 GHz]]** by\\
K. Kawaguchi, Y. Kasai, S.-I. Ishikawa, and N. Kaifu,\\
//Publ. Astron. Soc. Japan// **47** 853–876 (1995).

More recently, three transitions have been detected toward a low-mass protostar:\\
N. Sakai, T. Sakai, Y. Osamura, and S. Yamamoto,\\
**[[https://doi.org/10.1086/521979|Detection of C<sub>6</sub>H<sup>–</sup> toward the Low-Mass Protostar IRAS 04368+2557 in L1527]]**\\
//Astrophys. J.// **667**, L65–L68 (2007).


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Contributor(s): H. S. P. Müller; 11, 2006; 1, 2008

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