molecules:ism:c6h [CDMS classic documentation]

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===== On the Detection of Hexatriynyl, C6H, in Space =====

The hexatriynyl radical in its <sup>2</sup>Π<sub>3/2</sub> lower spin component has been detected toward TMC-1 by\\
H. Suzuki, M. Ohishi, N. Kaifu, S.-I. Ishikawa, and T. Kasuga,\\
**[[https://ui.adsabs.harvard.edu/abs/1986PASJ...38..911S|Detection of the Interstellar C<sub>6</sub>H Radical]]**,\\
//Publ. Astron. Soc. Japan// **38** 911–917 (1986) and\\
**[[https://ui.adsabs.harvard.edu/abs/1987PASJ...39..193S|Detection of C<sub>6</sub>H in the <sup>2</sup>Π<sub>1/2</sub> State toward IRC +10216]]** by\\
S. Saito, K. Kawaguchi, H. Suzuki, M. Ohishi, N. Kaifu, and S.-I. Ishikawa,\\
//Publ. Astron. Soc. Japan// **39** 193–199 (1987)\\
before it was actually detected in the laboratory.

Transitions of the lowest excited //v//<sub>11</sub> = 1 vibrational state have been identified very recently:\\
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** L83–L86 (2008).\\
The Renner-Teller interaction causes this state to split into three components: <sup>2</sup>Σ<sup>–</sup>, <sup>2</sup>Δ with spin-orbit splitting, and <sup>2</sup>Σ<sup>+</sup>. The lowest <sup>2</sup>Σ<sup>–</sup> state as well as both spin-components of the <sup>2</sup>Δ state were detected. The <sup>2</sup>Σ<sup>+</sup> was not seen; it is probably overlapped by the lower <sup>2</sup>Σ<sup>–</sup> state and possibly too weak to be recognized.


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Contributor(s): H. S. P. Müller; 11, 2006; 10, 2008

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