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--- molecules:ism:oxiran [2022/11/17 13:08] – mueller
+++ molecules:ism:oxiran [2023/06/09 13:56] (current) – mueller
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 //Astrophys. J.// **597**, Art. No. A53 (2017).\\
 This report is the first one on the detection of ethylene oxide around a low-mass protostar. The Protostellar Interferometric Line Survey (PILS) was carried out with ALMA in its Band 7 (329 – 363 GHz). A total of 20 lines were assigned to oxirane.\\
+\\
+A. Bacmann, A. Faure, and J. Berteaud\\
+gave an account of\\
+**[[https://doi.org/10.1021/acsearthspacechem.9b00072|Cold and Yet Complex: Detection of Ethylene Oxide in a Prestellar Core]]**\\
+//ACS Earth Space Chem.// **3**, 1000 (2019).\\
+They used the IRAM 30 m telescope to detect some lines at 3 and 2 mm toward L1689B.\\
+\\
+H. S. P. Müller, J. K. Jørgensen, J.-C. Guillemin, F. Lewen, and S. Schlemmer\\
+presented the\\
+**[[https://doi.org/10.1093/mnras/stac2525|Rotational Spectroscopy of Mono-deuterated Oxirane (//c//-C<sub>2</sub>H<sub>3</sub>DO) and Its Detection Towards IRAS 16293−2422 B]]**\\
+//Mon. Not. R. Astron. Soc.// **518**, 185 (2023).\\
+lines, corresponging to 19 transitions with 4 ≤ //J// ≤ 13 with diverse values of //K<sub>a</sub>// and //K<sub>c</sub>//, were identified in the PILS (Protostellar Interferometric Line Survey) data obtained with ALMA in its Band 7 (329 – 363 GHz). The //c//-C<sub>2</sub>H<sub>3</sub>DO to //c//-C<sub>2</sub>H<sub>4</sub>O ratio is ~0.15, which corresponds to a D-to-H ratio of ∼0.036 per H atom.\\
+\\
+H. S. P. Müller, J. K. Jørgensen, J.-C. Guillemin, F. Lewen, and S. Schlemmer\\
+presented more recently the\\
+**[[https://doi.org/10.1093/mnras/stac2525|Rotational Spectroscopy of Oxirane-//2,2-d//<sub>2</sub> (//c//-CD<sub>2</sub>CH<sub>2</sub>O) and Its Tentative Detection Toward IRAS 16293−2422 B]]**\\
+//J. Mol. Spectrosc.// **394**, Art. No. 111777 (2023).\\
+As in the case of the mono-deuterated oxirane above, lines were identifies in the PILS data.
+Five or six lines are essentially unblended and have a sufficient signal-to-noise ratio,
+two more lines are blended, and the combination of the contributions account nicely for the emission lines.
+So the identification was deemed to be somewhat tentative in this line-rich survey.
+From the estimate of the column density, one can derive a degree of deuteration per H atom of ~0.16,
+compared to ~0.036 per H atom in the case of //c//-C<sub>2</sub>H<sub>3</sub>DO.
+Such an enhancement of the degree of deuteration per H atom has also been seen for other
+doubly deuterated molecules compared to their mono-deuerated variants, such as CHD<sub>2</sub>CN,
+CHD<sub>2</sub>OCHO, CH<sub>3</sub>OCHD<sub>2</sub>, CHD<sub>2</sub>OH, and CHD<sub>2</sub>CHO.\\
 \\
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-Contributor(s): H. S. P. Müller; 08, 2012; 01, 2017
+Contributor(s): H. S. P. Müller; 08, 2012; 01, 2017; 11, 2022; 06, 2023
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