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| molecules:ism:c5h4 [2021/05/20 11:39] – mueller | molecules:ism:c5h4 [2022/04/25 15:47] (current) – mueller |
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| //Astron. Astrophys.// **647**, Art. No. L3 (2021).\\ | //Astron. Astrophys.// **647**, Art. No. L3 (2021).\\ |
| Ethynylallene, aka allenylacetylene or 1,2-pentadien-4-yne, was identified through 16 unblended or slightly blended //a//-type transitions with 6 ≤ //J// ≤ 10 and //K<sub>a</sub>// ≤ 3 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 32.8 and 49.2 GHz. The signal-to-noise ratio of the //K<sub>a</sub>// = 3 lines of these is on the edge, but the model supports the assignments. A value of //T//<sub>rot</sub> = 9 ± 1 K was derived through a rotation diagram, but the model is more compatible with 7 K. The column density of butenyne is about a factor of 4.5 higher than that of the isoelectronic allenyl cyanide. It is, in addition, similar to that of butenyne, a factor of 5 lower than that of the methyldiacetylene isomer (aka butadienyne), and a factor of 10 lower than that of methylacetylene (aka propyne).\\ | Ethynylallene, aka allenylacetylene or 1,2-pentadien-4-yne, was identified through 16 unblended or slightly blended //a//-type transitions with 6 ≤ //J// ≤ 10 and //K<sub>a</sub>// ≤ 3 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 32.8 and 49.2 GHz. The signal-to-noise ratio of the //K<sub>a</sub>// = 3 lines of these is on the edge, but the model supports the assignments. A value of //T//<sub>rot</sub> = 9 ± 1 K was derived through a rotation diagram, but the model is more compatible with 7 K. The column density of butenyne is about a factor of 4.5 higher than that of the isoelectronic allenyl cyanide. It is, in addition, similar to that of butenyne, a factor of 5 lower than that of the methyldiacetylene isomer (aka butadienyne), and a factor of 10 lower than that of methylacetylene (aka propyne).\\ |
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