===== 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.\\
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S. H. J. Wallström, S. Muller, E. Roueff, R. Le Gal, J. H. Black, and M. Gérin\\
reported on the\\
**[[https://doi.org/10.1051/0004-6361/201935860|Chlorine-bearing Molecules in Molecular Absorbers at Intermediate Redshifts]]**\\
//Astron. Astrophys.// **566**, (2014) Art. No. L6.\\
Both chloronium isotopologs were also detected in the //z// ≈ 0.68 foreground galaxy of the quasar B 0218+357; the 35Cl/37Cl isotopic ratio is about 2.2.\\
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Contributor(s): H. S. P. Müller; 06, 2014; 11, 2025
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