molecules:ism:methylformiat

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molecules:ism:methylformiat [2019/03/14 15:55] – muellermolecules:ism:methylformiat [2019/10/24 09:38] (current) – mueller
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 Methyl formate, HC(O)OCH<sub>3</sub>, is a typical hot core molecule. It is very abundant in massive star-forming regions. It was detected first in emission in Sgr B2 by\\ Methyl formate, HC(O)OCH<sub>3</sub>, is a typical hot core molecule. It is very abundant in massive star-forming regions. It was detected first in emission in Sgr B2 by\\
 R. D. Brown, J. G. Crofts, P. D. Godfrey, F. F. Gardner, B. J. Robinson, and J. B. Whiteoak,\\ R. D. Brown, J. G. Crofts, P. D. Godfrey, F. F. Gardner, B. J. Robinson, and J. B. Whiteoak,\\
-**[[http://cdsads.u-strasbg.fr/abs/1975ApJ...197L..29B|Discovery of Interstellar Methyl Formate]]**\\+**[[https://ui.adsabs.harvard.edu/abs/1975ApJ...197L..29B|Discovery of Interstellar Methyl Formate]]**\\
 //Astrophys. J.// **197**, L29–L31 (1975).\\ //Astrophys. J.// **197**, L29–L31 (1975).\\
 The //A// component of the 1<sub>10</sub> – 1<sub>11</sub> near 1610 GHz was clearly seen with the Parkes 64 m telescope, and there was evidence for the //E// component close by.\\ The //A// component of the 1<sub>10</sub> – 1<sub>11</sub> near 1610 GHz was clearly seen with the Parkes 64 m telescope, and there was evidence for the //E// component close by.\\
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 More recently,\\ More recently,\\
 S. Takano, Y. Sakai, S. Kakimoto, M. Sasaki, and K. Kobayashi reported on the\\ S. Takano, Y. Sakai, S. Kakimoto, M. Sasaki, and K. Kobayashi reported on the\\
-**[[http://cdsads.u-strasbg.fr/abs/2012PASJ...64...89T|Detection of Methyl Formate in the Second Torsionally Excited State (//v<sub>t</sub>// = 2) in Orion KL]]**\\+**[[https://ui.adsabs.harvard.edu/abs/2012PASJ...64...89T|Detection of Methyl Formate in the Second Torsionally Excited State (//v<sub>t</sub>// = 2) in Orion KL]]**\\
 //Publ. Astron. Soc. Japan// **64**, Art. No. 89 (2012).\\ //Publ. Astron. Soc. Japan// **64**, Art. No. 89 (2012).\\
 Four new lines were observed newly with the Nobeyama 45 m radio telescope near 90 GHz together with several transitions of the ground and the first excited torsional state. 15 additional lines were detected in two published line surveys. The derived vibrational temperature of about 125 K was higher than the rotational temperature of around 50 K, possibly indicating infrared pumping. Since the torsional modes are rather weak, it may be more likely that infrared pumping took place via some small amplitude vibration and subsequent intermolecular energy redistribution. However, as the authors indicated, collisional excitation cannot be ruled out a being responsible for the vibrational temperature being apparently higher than the rotational one. Four new lines were observed newly with the Nobeyama 45 m radio telescope near 90 GHz together with several transitions of the ground and the first excited torsional state. 15 additional lines were detected in two published line surveys. The derived vibrational temperature of about 125 K was higher than the rotational temperature of around 50 K, possibly indicating infrared pumping. Since the torsional modes are rather weak, it may be more likely that infrared pumping took place via some small amplitude vibration and subsequent intermolecular energy redistribution. However, as the authors indicated, collisional excitation cannot be ruled out a being responsible for the vibrational temperature being apparently higher than the rotational one.
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 Contributor(s): H. S. P. Müller; 02, 2007; 04, 2011; 07, 2012; 08, 2012; 11, 2016; 03, 2019 Contributor(s): H. S. P. Müller; 02, 2007; 04, 2011; 07, 2012; 08, 2012; 11, 2016; 03, 2019
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