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| molecules:ism:ch3chs [2025/01/30 15:29] – mueller | molecules:ism:ch3chs [2025/01/30 15:35] (current) – mueller |
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| **[[https://doi.org/10.1051/0004-6361/202453459|Detection of Thioacetaldehyde (CH<sub>3</sub>CHS) in TMC-1: Sulfur-oxygen Differentiation along the Hydrogenation Sequence]]**\\ | **[[https://doi.org/10.1051/0004-6361/202453459|Detection of Thioacetaldehyde (CH<sub>3</sub>CHS) in TMC-1: Sulfur-oxygen Differentiation along the Hydrogenation Sequence]]**\\ |
| //Astron. Astrophys.// **693**, Art. No. L20 (2025).\\ | //Astron. Astrophys.// **693**, Art. No. L20 (2025).\\ |
| //ortho//-CH<sub>2</sub>C<sub>3</sub>N was identified through three //a//-type transitions with //J// = 8 − 7 to 10 − 9 and //K<sub>a</sub>// = 0 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 50.4 GHz. These transitions displayed partially resolved fine and hyperfine structure splitting; few components were blended by lines of other species. Also observed were four transitions of //para//-CH<sub>2</sub>C<sub>3</sub>N with //J// = 8 − 7 or 9 − 8 and //K<sub>a</sub>// = 1, which displayed well resolved fine structure splitting; some of these lines were also blended. A value of //T//<sub>rot</sub> = 7 ± 1 K was derived. The column density of CH<sub>2</sub>C<sub>3</sub>N is about a factor of 100 lower than that of CH<sub>2</sub>CN. And while CH<sub>2</sub>C<sub>3</sub>N is roughly a factor of 10 less abundant than CH<sub>3</sub>C<sub>3</sub>N, CH<sub>2</sub>CN is **more abundant** than CH<sub>3</sub>CN by a factor of about 3.\\ | Thioacetaldehyde, also known as ethanthial, was identified through four //a//-type transitions with //J// = 3 − 2 and 4 − 3 and //K<sub>a</sub>// ≤ 1 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 50.4 GHz. The transitions displayed resolved methyl internal rotation splitting; the E component of 3<sub>03</sub> − 2<sub>02</sub> is blended. A value of //T//<sub>rot</sub> = 9 K was assumed. Its column density is about a factor of 36 lower than that of acetaldehyde.\\ |
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