Microwave and submillimeter spectroscopy and first ISM detection of 18O-methyl formate - Archive ouverte HAL Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2012

Microwave and submillimeter spectroscopy and first ISM detection of 18O-methyl formate

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Abstract

Context. Astronomical survey of interstellar molecular clouds needs a previous analysis of the spectra in the microwave and sub-mm energy range to be able to identify them. We obtained very accurate spectroscopic constants in a comprehensive laboratory analysis of rotational spectra. These constants can be used to predict transition frequencies that were not measured in the laboratory very precisely. Aims: We present an experimental study and a theoretical analysis of two 18O-methyl formate isotopologues, which were subsequently detected for the first time in Orion KL. Methods: The experimental spectra of both methyl formate isotopologues recorded in the microwave and sub-mm range from 1 to 660 GHz. Both spectra were analysed by using the rho-axis method (RAM) which takes into account the CH3 internal rotation. Results: We obtained spectroscopic constants of both 18O- methyl formate with high accuracy. Thousands of transitions were assigned and others predicted, which allowed us to detect both species in the IRAM 30 m line survey of Orion KL. Full Tables A.1 et A.2 are available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/538/A119
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Dates and versions

hal-00904909 , version 1 (24-11-2022)

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B. Tercero, Laurent Margulès, M. Carvajal, Roman A. Motiyenko, T. R. Huet, et al.. Microwave and submillimeter spectroscopy and first ISM detection of 18O-methyl formate. Astronomy and Astrophysics - A&A, 2012, 538, pp.119. ⟨10.1051/0004-6361/201117072⟩. ⟨hal-00904909⟩
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