This shows you the differences between two versions of the page.
| Next revision | Previous revision |
| molecules:ism:ecp [2022/08/03 10:45] – created mueller | molecules:ism:ecp [2023/09/27 15:57] (current) – mueller |
|---|
| **[[https://doi.org/10.1051/0004-6361/202244399|Discovery of fulvenallene in TMC-1 with the QUIJOTE line survey]]**\\ | **[[https://doi.org/10.1051/0004-6361/202244399|Discovery of fulvenallene in TMC-1 with the QUIJOTE line survey]]**\\ |
| //Astron. Astrophys.// **663**, Art. No. L9 (2022).\\ | //Astron. Astrophys.// **663**, Art. No. L9 (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 was carried out with the Yebes 40 m radio telescope between 31.0 and 50.4 GHz. Ethenylidenecyclopentadiene, aka fulvenallene, was detected in several //a//-type transitions having 8 ≤ //J// ≤ 14 and //K<sub>a</sub>// ≤ 3. A considerable fraction of the lines is not or only slightly blended. A value of //T//<sub>rot</sub> = 9 ± 1 K was derived through a rotation diagram. Its column density is only about a factor of 4.5 lower than that of cyclopentadiene and about a factor of 11 to 26 of what has been estimated for ethene.\\ |
| 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 the abundances among the cyanopropenes do not at all reflect relative energies among these species.\\ | \\ |
| |
| ---- | ---- |