molecules:ism:hydroxypropenal

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molecules:ism:hydroxypropenal [2022/04/25 15:47] – muellermolecules:ism:hydroxypropenal [2024/08/15 19:25] (current) – mueller
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 //Astron. Astrophys.// **660** (2022), Art. No. L6.\\  //Astron. Astrophys.// **660** (2022), Art. No. L6.\\ 
 3-Hydroxypropenal is the enol form of malonaldehyde. This enolic form is more stable than the dial because of intermolecular hydogen bonding. The molecule was identified through 11 lines in Band 7 corresponding to 19 //b//-type rotational transitions. Some of these are fully or partially blended. Two additional lines were clearly detected in Band 6 data. Rotation-tunneling transitions of //a//-type symmetry may be observable for somewhat higher excitation temperatures. However, the rest frequencies of stronger ones with low values of //K<sub>a</sub>// are so uncertain that they can not be identified unambiguously. Its fractional abundance with respect to methanol is ~10<sup>−4</sup>.\\ 3-Hydroxypropenal is the enol form of malonaldehyde. This enolic form is more stable than the dial because of intermolecular hydogen bonding. The molecule was identified through 11 lines in Band 7 corresponding to 19 //b//-type rotational transitions. Some of these are fully or partially blended. Two additional lines were clearly detected in Band 6 data. Rotation-tunneling transitions of //a//-type symmetry may be observable for somewhat higher excitation temperatures. However, the rest frequencies of stronger ones with low values of //K<sub>a</sub>// are so uncertain that they can not be identified unambiguously. Its fractional abundance with respect to methanol is ~10<sup>−4</sup>.\\
 +\\
  
 +H. S. P. Müller, A. Coutens, J. K. Jørgensen, L. Margulès, R. A. Motiyenko, and J.-C. Guillemin\\
 +published on\\
 +**[[https://doi.org/10.1051/0004-6361/202450029|The rotation-tunneling spectrum of 3-hydroxypropenal and confirmation of its detection toward IRAS 16293−2422 B]]**\\
 +//Astron. Astrophys.// **687** (2024), Art. No. A8.\\ 
 +The authors reported a very extensive line list from new (sub-) millimeter spectroscopic measurements. They were able to constrain the rotational temperature to 125 K. No additional lines were identified in the PILS data, but 7 additional lines were identified in archival ALMA data of the same source and with a similar spatial resolution. The column density is roughly a factor of 2.2 lower than that of propanal, a factor of about 42 lower than that of propene, and about a factor of 3 higher than that of propenal. The detection is now certainly beyond any doubt.\\
 +\\
  
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-Contributor(s): H. S. P. Müller; 04, 2022+Contributor(s): H. S. P. Müller; 04, 2022; 08, 2024
  
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