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

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 ( or via
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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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