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| molecules:ism:h2co3 [2023/08/22 11:51] – mueller | molecules:ism:h2co3 [2023/08/24 12:37] (current) – mueller |
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| **[[https://doi.org/10.3847/1538-4357/ace523|Discovery of the Elusive Carbonic Acid (HOCOOH) in Space]]**,\\ | **[[https://doi.org/10.3847/1538-4357/ace523|Discovery of the Elusive Carbonic Acid (HOCOOH) in Space]]**,\\ |
| //Astrophys. J.// **954**, Art. No. 3 (2023)\\ | //Astrophys. J.// **954**, Art. No. 3 (2023)\\ |
| Five lines have good signal-to-noise ratios (S(N) and are unblended or only slightly blended. Some more are more blended or have a less favorable S/N, but strengthen the detection somewhat. As an oblate rotor fairly close to the symmetric limit, the lines frequently consist of quartets of //b//- and //a//-type transitions having the same //J// and //K<sub>c</sub>//. The detected //cis//-//trans// conformer is slightly higher in energy than the //cis//-//cis// conformer, however, this latter conformer has a much lower dipole moment. //Cis//-//trans// carbonic acid is about a factor of ~6.5 and ~31 less abundant than acetic and formic acid, respectively. The //cis//-//cis// conformer may reduce these factors by a factor of around 1.5, possibly more.\\ | The molecule was detected in the course of a molecular line survey of the Galactic Center molecular cloud G+0.693–0.027 employing the Yebes 40 m and IRAM 30 m radio telecopse. The transitions cover 40 to 111 GHz with 2 ≤ //J// ≤ 9 and //K<sub>a</sub>// ≤ 4. Five lines have good signal-to-noise ratios (S/N) and are unblended or only slightly blended. Some additional ones are more blended or have a less favorable S/N, but strengthen the detection somewhat. As an oblate rotor fairly close to the symmetric limit, the lines frequently consist of quartets of //b//- and //a//-type transitions having the same //J// and //K<sub>c</sub>//. The detected //cis//-//trans// conformer is slightly higher in energy than the //cis//-//cis// conformer, however, this latter conformer has a much lower dipole moment. //Cis//-//trans// carbonic acid is about a factor of ~6.5 and ~31 less abundant than acetic and formic acid, respectively. The //cis//-//cis// conformer may reduce these factors by a factor of around 1.5, possibly more.\\ |
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