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Detection of Butadiynyliminomethylium, HC5N+, 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
Tentative Detection of HC<sub>5</sub>NH<sup>+</sup> in TMC-1
Astron Astrophys. 643, Art. No. L6 (2020).
Seven transitions, J“ = 12 and 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 HC5NH+ as the most likely carrier of these lines. The abundance ratio of HC5N to HC5NH+ is ~500, very similar to that of HC3N to HC3NH+, which can be seen as additional support for the identification. The “tentative” in the title refers to the identification of the carrier, but may be viewed as almost definitive.
Contributor(s): H. S. P. Müller 10, 2020