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. ===== Detection of Protonated HC<sub>5</sub>N in the ISM ===== N. Marcelino, M. Agúndez, B. Tercero, C. Cabezas, C. Bermúdez, J. D. Gallego, P. de Vicente, and J. Cernicharo, \\ reported on the\\ **[[https://doi.org/10.1051/0004-6361/202039251|Tentative Detection of HC<sub>5</sub>NH<sup>+</sup> in TMC-1]]**\\ //Astron Astrophys.// **643**, Art. No. L6 (2020).\\ Seven transitions, from //J"// = 12 to 18 between about 33.7 and 49.2 GHz, of a new, unknown molecule were detected in the course of a molecular line survey of the prototypical cold dark molecular cloud TMC-1 carried out with the Yebes 40 m radio telescope. Quantum-chemical calculations yielded HC<sub>5</sub>NH<sup>+</sup> as the most likely carrier of these lines. The abundance ratio of HC<sub>5</sub>N to HC<sub>5</sub>NH<sup>+</sup> is ~240, very similar to that of HC<sub>3</sub>N to HC<sub>3</sub>NH<sup>+</sup>, which can be seen as additional support for the identification. The "tentative" in the title refers to the identification of the carrier. The spectroscopic parameters are very similar to those of **[[molecules:ism:NC4NH-plus|NC]]<sub>4</sub>NH<sup>+</sup>**. But with the detection of the latter, this has been settled.\\ \\ ---- Contributor(s): H. S. P. Müller 10, 2020; 03, 2022; 12, 2022 ---- molecules/ism/butadiynyliminomethylium.txt Last modified: 2022/12/27 14:14by mueller