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--- molecules:ism:cyclopropenon [2019/05/09 12:40] – mueller
+++ molecules:ism:cyclopropenon [2026/02/03 14:29] (current) – mueller
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-===== Cyclopropenone, c-H2C3O, in Sgr B2(N) =====
+===== Cyclopropenone, c-H2C3O, in the Interstellar Medium =====
 Cyclopropenone, c-H<sub>2</sub>C<sub>3</sub>O, has been detected with the 100 m Greenbank telescope toward Sgr B2(N) – largely in absorption:\\
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 **[[https://doi.org/10.1086/501121|Cyclopropenone (c-H<sub>2</sub>C<sub>3</sub>O) a new Interstellar Ring Molecule]]**\\
 //Astrophys. J.// **642**, 933–939 (2006).\\
-The molecule was detected in the six lower energy //a//-type transitions between 8 and 45 GHz. It was not seen in two higher energy transitions. This and the appearance largely in absorption suggests the molecule to be present in the colder and less dense envelope of Sgr B2(N). The molecule can be viewed as a derivative of the ubiquitous, small aromatic cyclopropenylidene, //c//-C<sub>3</sub>H<sub>2</sub>.
+The molecule was detected in the six lower energy //a//-type transitions between 8 and 45 GHz. It was not seen in two higher energy transitions. This and the appearance largely in absorption suggests the molecule to be present in the colder and less dense envelope of Sgr B2(N). The molecule can be viewed as a derivative of the ubiquitous, small aromatic cyclopropenylidene, //c//-C<sub>3</sub>H<sub>2</sub>.\\
+\\
 J.-C. Loison, M. Agúndez, N. Marcelino, V. Wakelam, K. M. Hickson, J. Cernicharo, M. Gerin, E. Roueff, and M. Guélin\\
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 **[[https://doi.org/10.1093/mnras/stv2866|The interstellar chemistry of H<sub>2</sub>C<sub>3</sub>O isomers]]**\\
 //Mon. Not. R. Astron. Soc.// **456**, 4101–4110 (2016).\\
-The molecule was detected in the 7<sub>1,6</sub> – 6<sub>1,5</sub> transition near 103.1 GHz toward four of seven dark clouds employing the IRAM 30 m telescope. The four sources are TMC-1, B1-b, L483, and Lupus-1A.
+The molecule was detected in the 7<sub>1,6</sub> – 6<sub>1,5</sub> transition near 103.1 GHz toward four of seven dark clouds employing the IRAM 30 m telescope. The four sources are TMC-1, B1-b, L483, and Lupus-1A.\\
+\\
+In their work on the\\
+**[[https://doi.org/10.1051/0004-6361/202557355|Discovery of Linear Propadienone — Study of the Chemistry of Linear and Cyclic H2C3O and H2C3S in TMC-1]]**\\
+//Astron. Astrophys.// **705**, Art. No. A206 (2026),\\
+G. Esplugues, J. C. Loison, M. Agúndez, G. Molpeceres, N. Marcelino, B. Tercero, and J. Cernicharo\\
+also identify isotopic species of cyclopropenone. Two //a//-type transitions were detected for the C<sub>2</sub> (ethene-type) position, c-H<sub>2</sub><sup>13</sup>CCCO, yielding a c-H<sub>2</sub>C<sub>3</sub>O to c-H<sub>2</sub><sup>13</sup>CCCO of 23 ± 9 and a <sup>12</sup>C to <sup>13</sup>C ratio of 46 ± 18 because of the two equivalent C<sub>2</sub> positions. Only one //a//-type transition had enough intensity in the case of the carbonyl C (C<sub>1</sub>), making the identification somewhat tentative. The <sup>12</sup>C to <sup>13</sup>C ratio is about 57. c-HDC<sub>3</sub>O was also identified with a H to D ratio of 24 ± 10 because of the two equivalent H positions.\\
+\\
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 Contributor(s): H. S. P. Müller; 02, 2006; 02, 2016
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