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| molecules:ism:c3h5cn [2022/07/28 12:52] – mueller | molecules:ism:c3h5cn [2024/01/31 12:39] – mueller |
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| ===== On Cyanides Derived from Propene in the ISM ===== | ===== On the Discovery of Cyanopropenes in the ISM ===== |
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| J. Cernicharo, R. Fuentetaja, C. Cabezas, M. Agúndez, N. Marcelino, B. Tercero, J. R. Pardo, and P. de Vicente\\ | J. Cernicharo, R. Fuentetaja, C. Cabezas, M. Agúndez, N. Marcelino, B. Tercero, J. R. Pardo, and P. de Vicente\\ |
| //Astron. Astrophys.// **663**, Art. No. L5 (2022).\\ | //Astron. Astrophys.// **663**, Art. No. L5 (2022).\\ |
| The molecular line survey is of the prototypical cold dark molecular cloud TMC-1 and was carried out with the Yebes 40 m radio telescope between 31.0 and 50.4 GHz. 2-Butenenitrile, aka 1-cyanopropene or crotononitrile, was detected in its //E// (or //trans//) and //Z// (or //cis//) stereoisomeric forms. In addition, 2-propenenitrile, aka 2-cyanopropene or methacrylonitrile was also identified as was 3-butenenitrile, aka 3-cyanopropene or allyl cyanide, in its //syn// (or //cis//) and //gauche// conformers. | The molecular line survey is of the prototypical cold dark molecular cloud TMC-1 and was carried out with the Yebes 40 m radio telescope between 31.0 and 50.4 GHz. 2-Butenenitrile, aka 1-cyanopropene or crotononitrile, was detected in its //E// (or //trans//) and //Z// (or //cis//) stereoisomeric forms. In addition, 2-propenenitrile, aka 2-cyanopropene or methacrylonitrile was also identified as was 3-butenenitrile, aka 3-cyanopropene or allyl cyanide, in its //syn// (or //cis//) and //gauche// conformers. |
| Several //a//-type transitions having 4 ≤ //J// ≤ 8 to 6 ≤ //J// ≤ 11 and //K<sub>a</sub>// ≤ 2 were identified. A value of //T//<sub>rot</sub> = 7 ± 1 K was derived through rotation diagrams in all instances. The column densities (in units of 10<sup>10</sup> cm<sup>–2</sup>) of the butenenitriles is about 5, 13, 10, 7, and 8 for the //E//-1-, //Z//-1-, 2-, //syn//-3-, and //gauche//-3-forms, respectively, compared to ~4 × 10<sup>13</sup> cm<sup>–2</sup> for propene. The combined cyanopropenes are much less abundant compared to its parent hydrocarbon compared to other detected cyanide derivatives. It is also noteworthy to point out that the abundances among the cyanopropenes do not at all reflect relative energies among these species.\\ | Several //a//-type transitions having 4 ≤ //J// ≤ 8 to 6 ≤ //J// ≤ 11 and //K<sub>a</sub>// ≤ 2 were identified. A value of //T//<sub>rot</sub> = 7 ± 1 K was derived through rotation diagrams in all instances. The column densities (in units of 10<sup>10</sup> cm<sup>−2</sup>) of the butenenitriles is about 5, 13, 10, 7, and 8 for the //E//-1-, //Z//-1-, 2-, //syn//-3-, and //gauche//-3-forms, respectively, compared to ~4 × 10<sup>13</sup> cm<sup>−2</sup> for propene. The combined cyanopropenes are much less abundant in relation to its parent hydrocarbon compared to other detected cyanide derivatives. It is also noteworthy to point out that, unsurprisingly, the abundances among the cyanopropenes do not at all reflect relative energies among these species.\\ |
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