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| molecules:ism:cyanoacenaphtalin [2024/10/28 10:13] – created mueller | molecules:ism:cyanoacenaphtalin [2026/01/09 13:09] (current) – mueller |
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| **[[https://doi.org/10.1051/0004-6361/202452196|Discovery of Two Cyano Derivatives of Acenaphthylene (C<sub>12</sub>H<sub>8</sub>) in TMC-1 with the QUIJOTE Line Survey]]**\\ | **[[https://doi.org/10.1051/0004-6361/202452196|Discovery of Two Cyano Derivatives of Acenaphthylene (C<sub>12</sub>H<sub>8</sub>) in TMC-1 with the QUIJOTE Line Survey]]**\\ |
| //Astron. Astrophys.// **690**, Art. No. L13 (2024).\\ | //Astron. Astrophys.// **690**, Art. No. L13 (2024).\\ |
| The observations were obtained in the course of the line survey Green Bank Telescope Observations of TMC-1: Hunting for Aromatic Molecules. The data were recorded with very high resolution which resolves, at least in part, the complex velocity structure and the <sup>14</sup>N hyperfine structure splitting. The molecules 1-cyanonaphtalene and 2-cyanonaphtalene were indentified through line-stacking with good signal-to-noise ratios. In fact, after additional observations carried out in the review process, the S/Ns of some lines of 1-cyanonaphtalene were good enough to be identified individually after modest smoothing. Both molecules are obviously not hydrocarbons, but simple hydrocarbon derivatives.\\ | The molecular line survey was carried out with the Yebes 40 m radio telescope between 31.0 and 50.4 GHz. The two cyanoacenaphtalene isomers 1- and 5-C<sub>12</sub>H<sub>7</sub>CN were detected while the 3- and 4-C<sub>12</sub>H<sub>7</sub>CN isomers were not detected. While all of the isomers are asymmetric rotors of the prolate type, the detected isomers are more asymmetric (or closer to an oblate top asymmetric rotor).\\ |
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| | The molecules were identified through a plethora of //a//-type rotational transitions, several series easier to detect because of oblate pairing of the transitions having the same //K<sub>c</sub>// close to //J//. The derived column densities were equal, and a rotational temprerature of 9 K was derived. The authours also detected many lines of 1- and 2-cyanonaphtalene, again with equal column densities. Interestingly, the column densities of these slightly smaller molecules were about a factor of 1.7 lower than those of each of the cyanoacenaphtalenes.\\ |
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| | The authors also search for the parent acenaphthylene molecule and cyanofluorene isomers, but found neither.\\ |
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| | More recently,\\ |
| | J. Cernicharo, B. Tercero, N. Marcelino, J. A. López-Pérez, J. D. Gallego, F. Tercero, G. Esplugues, C. Cabezas, M. Agúndez, C. Limeres, A. L. Steber, D. Pérez, C. Pérez, A. Lesarri, and P. de Vicente\\ |
| | announced the\\ |
| | **[[https://doi.org/10.1051/0004-6361/202452196|Discovery of Two New Isomers of Cyanoacenaphthylene (C<sub>12</sub>H<sub>8</sub>) in the Taurus molecular cloud 1 with the QUIJOTE Line Survey]]**\\ |
| | //Astron. Astrophys.// **705**, Art. No. L7 (2026).\\ |
| | The identifications were made under conditions similar to the previous two isomers. The column densities of 3- and 4-cyanoacenaphthylene are about 3/4 and 1/2, respectively of those of each of the 1- and 5 cyanoacenaphthylene isomers.\\ |
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| Contributor(s): H. S. P. Müller; 10, 2024 | Contributor(s): H. S. P. Müller; 10, 2024; 01, 2026 |
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