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--- molecules:ism:ch3c4h [2025/11/28 13:14] – mueller
+++ molecules:ism:ch3c4h [2025/11/28 13:27] (current) – mueller
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 //Astron. Astrophys.// **657** Art. No. L5 (2022).\\
 Twelve transition with //J// = 8 to 12 and //K<sub>a</sub>// ≤ 1 were detected with the Yebes 40 m radio telescope. The CH<sub>3</sub>C<sub>4</sub>H to CH<sub>2</sub>DC<sub>4</sub>H abundance ratio of 24 ± 2 is very similar to that of CH<sub>3</sub>C<sub>3</sub>N to CH<sub>2</sub>DC<sub>3</sub>N ratio of 22 ± 2.\\
+\\
+More recently,\\
+C. Cabezas, M. Agúndez, E. Roueff, R. Fuentetaja, B. Tercero, N. Marcelino, P. de Vicente, and J. Cernicharo\\
+announced the\\
+**[[https://doi.org/10.1051/202557754|Detection of Six Isotopologues of CH<sub>3</sub>CCCCH in TMC-1 with the QUIJOTE Line Survey]]**,\\
+//Astron. Astrophys.// **703** Art. No. L22 (2025).\\
+With an increase of the signal-to-noise ratio in comparison to the previous item, the authors were able to identify transition with //J// = 8 to 12 and //K<sub>a</sub>// ≤ 1 of all five singly substituted <sup>13</sup>C isotopologs and of CH<sub>3</sub>C<sub>4</sub>D with reasonable to good S/N and mostly not or only slightly blended. The lowest //J// pair of CH<sub>3</sub>C<sub>4</sub>D transitions was not covered. The <sup>12</sup>C/<sup>13</sup>C ratio is 93 ± 11, while the H/D ratio in the case of CH<sub>3</sub>C<sub>4</sub>D is 54 ± 8.\\
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-Contributor(s): H. S. P. Müller; 7, 2004; 10, 2017; 03, 2022
+Contributor(s): H. S. P. Müller; 7, 2004; 10, 2017; 03, 2022; 11, 2025
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