molecules:ism:oxiran

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molecules:ism:oxiran [2022/11/17 14:30] – muellermolecules:ism:oxiran [2023/06/09 13:56] (current) – mueller
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 //Mon. Not. R. Astron. Soc.// **518**, 185 (2023).\\ //Mon. Not. R. Astron. Soc.// **518**, 185 (2023).\\
 17 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.\\ 17 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; 11, 2022+Contributor(s): H. S. P. Müller; 08, 2012; 01, 2017; 11, 2022; 06, 2023
  
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