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--- molecules:ism:c2h-plus [2026/10/13 09:54] – mueller
+++ molecules:ism:c2h-plus [2026/10/13 09:59] (current) – mueller
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 **[[https://doi.org/10.1051/0004-6361/202661924|First Detection of C2H+ in the Interstellar Medium]]**\\
 //Astron. Astrophys.// **714**, Art. No. A137 (2026).\\
-Ethynylium, with a <sup>3</sup>Π electronic ground state, was detected with the APEX 12 m sub-mm telescope in its lowest Ω = 2 //J// = 3 − 2 transition near 211.5 GHz toward the Orion Bar. The four strong hyperfine transitions, Δ//F// = +1, two each in the //f// and //e// Λ-doublets, were detected with good signal-to-noise ratio (S/N). The S/N was too low to detect the two weaker Δ//F// = 0 transitions.
+Ethynylium, with a <sup>3</sup>Π electronic ground state, was detected with the APEX 12 m sub-mm telescope in its lowest Ω = 2 //J// = 3 − 2 transition near 211.5 GHz toward the Orion Bar. The four strong hyperfine transitions, Δ//F// = +1, two each in the //f// and //e// Λ-doublets, were detected with good signal-to-noise ratio (S/N). The S/N was too low to detect the two weaker Δ//F// = 0 transitions. Ethynylium is about a factor of 15000 less abundant that the neutral C<sub>2</sub>H and about a factor of ~40 less than //l//-C<sub>3</sub>H.\\
+\\
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+Contributor(s): H. S. P. Müller; 10, 2026
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