S. Muller, R. Le Gal, E. Roueff, J. H. Black, A. Faure, M. Guélin, A. Omont, M. Gérin, F. Combes, and S. Aalto
reported on the
Protonated Acetylene in the //z// = 0.89 Molecular Absorber toward PKS 1830−211
Astron. Astrophys. 683, (2024) Art. No. A62.

The molecule C₂H₃⁺ was identified through the ortho-transition 2₁₂ – 1₀₁ at a rest frequency of 494.034 GHz and through the para-transition 1₁₁ – 0₀₀ at a rest frequency of 431.315 GHz. Protonated acetylene is less abundant than C₂H and C₄H by factors of about 600 and 60, respectively.

Contributor(s): H. S. P. Müller; 03, 2024