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--- molecules:ism:ethynylcyclopropenylidene [2021/05/18 14:57] – mueller
+++ molecules:ism:ethynylcyclopropenylidene [2021/05/18 15:26] (current) – mueller
@@ Line 5: / Line 5: @@
 **[[https://doi.org/10.1051/0004-6361/202141156|Pure hydrocarbon cycles in TMC-1: Discovery of ethynylcyclopropenylidene, cyclopentadiene, and indene]]**\\
 //Astron. Astrophys.// **649**, Art. No. L15 (2021).\\
-Ethynylcyclopropenylidene, //c//-C<sub>3</sub>HCCH, was identified through 12 unblended or slightly blended mostly //b//-type transitions with 1 ≤ //J// ≤ 10 and //K<sub>a</sub>// ≤ 1 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. A value of //T//<sub>rot</sub> = 8 ± 3 K was derived. 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).\\
+Ethynylcyclopropenylidene, //c//-C<sub>3</sub>HCCH, was identified through 12 unblended or slightly blended mostly //b//-type transitions with 1 ≤ //J// ≤ 10 and //K<sub>a</sub>// ≤ 1 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. A value of //T//<sub>rot</sub> = 8 ± 3 K was derived through a rotation diagram, but the model is more compatible with 10 K. The column density of //c//-C<sub>3</sub>HCCH is about a factor of 190 lower than that of //c//-C<sub>3</sub>H<sub>2</sub> and about a factor of 20 lower than that of //c//-C<sub>3</sub>H.\\