R. Fuentetaja, M. Agúndez, C. Cabezas, B. Tercero, N. Marcelino, J. R. Pardo, P. de Vicente, and J. Cernicharo
reported on
Discovery of Two New Interstellar Molecules with QUIJOTE: HCCCHCCC and HCCCCS
Astron. Astrophys. 667, Art. No. L4 (2022).
Ethnylbutatrienylidene was detected through 27 a-type transitions with K_a ≤ 2 and 9 ≤ J ≤ 15 and good to reasonable signal-to-noise ratios 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 between 31.0 and 50.3 GHz. Ethnylbutatrienylidene is, after hexapentaenylidene, C₆H₂, and triacetlylene, the third C₆H₂ isomer detected in space. Its abundance is about a factor of 1.6 higher than that of the slightly lower lying C₆H₂ molecule.

Contributor(s): H. S. P. Müller; 11, 2022