===== On Benzyne in the ISM =====

J. Cernicharo, M. Agúndez, R. I. Kaiser, C. Cabezas, B. Tercero, N. Marcelino, J. R. Pardo, and P. de Vicente\\
reported on the\\
**[[https://doi.org/10.1051/0004-6361/202141660|Discovery of Benzyne, //o//-C<sub>6</sub>H<sub>4</sub>, in TMC-1 with the QUIJOTE Line Survey]]**\\
//Astron. Astrophys.// **652**, Art. No. L9 (2021).\\
The //ortho// isomer of benzyne, //c//-C<sub>6</sub>H<sub>4</sub>, was identified through nine //b//-type transitions with 2 ≤ //J// ≤ 7 and //K<sub>a</sub>// ≤ 2 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. Six of these lines appear to be unblended or only slightly blended. A value of //T//<sub>rot</sub> ≈ 7 K was derived. The column density of //ortho//-benzyne is much lower than that of, e.g., cyclopentadiene and indene and similar to that of ethynylcylopropenylidene.\\


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Contributor(s): H. S. P. Müller; 08, 2021

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