===== Chloronium, H2Cl+, in Extragalactic Sources ===== S. Muller, J. H. Black, M. Guélin, C. Henkel, F. Combes, M. Gérin, S. Aalto, A. Beelen, J. Darling, C. Horellou, S. Martín, K. M. Menten, Dinh-V-Trung, and M. A. Zwaan,\\ reported on the\\ **[[https://doi.org/10.1051/0004-6361/201423947|Detection of chloronium and measurement of the ³⁵Cl/³⁷Cl isotopic ratio at //z// = 0.89 toward PKS 1830-211]]**\\ //Astron. Astrophys.// **566**, (2014) Art. No. L6.\\ The 1₁₁ –0₀₀ transitions of H₂³⁵Cl⁺ and H₂³⁷Cl⁺ were observed with ALMA redshifted from about 485 GHz to about 257 GHz. The ³⁵Cl/³⁷Cl isotopic ratio agrees within error bars with the terrestrial ratio. ---- Contributor(s): H. S. P. Müller; 06, 2014 ----