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Title:MILLIMETER WAVE SPECTRUM OF METHYL KETENE AND ITS SEARCH IN ORION
Author(s):Margulès, L.
Contributor(s):Ellinger, Y.; Guillemin, J.-C.; Cernicharo, Jose; Tercero, Belén; Motiyenko, R. A.; Bermúdez, Celina
Subject(s):Mini-symposium: ALMA's Molecular View
Abstract:The knowledge of synthetic routes of complex organic molecules is still far to be fully understood. The creation of reliable models is particularly challenging. Hollis et al.footnote{Hollis, J. M.; {em et al.}, 2006, {em ApJ}~{bf642}, 933} pointed out that the observations of molecular isomers provides an excellent tool to evaluate the hypothesis of the synthetic pathways. In the group of isomers chem{C_3H_4O} that contains two unsaturations, the three most stable are cyclopropanone, propenal (also known as acrolein) and methyl ketene. Among these isomers, only propenal was tentatively detected in Sgr B2(N)footnote{Hollis, J. M.; {em et al.}, 2006, {em ApJ}~{bf643}, L25}. Spectroscopic measurements of methyl ketene chem{CH_3CHCO} are limited to the microwave domainfootnote{Bak, B.; {em et al.}, 1966, {em J. Chez. Phys.}~{bf45}, 883}. We extended the measurements into millimeter waves in order to provide accurate frequency predictions suitable for astrophysical purposes. Methyl ketene has one more carbon atom than acetaldehyde (chem{CH_3CHO}) and in terms of rotational spectroscopy is quite similar to acetaldehyde. The analysis of the rotational spectrum of methyl ketene is complicated due to internal rotation of the methyl group, that is characterized by the barrier of intermediate height $V_3 =$ 416 wn, and by quite large value of the coupling parameter $rho = 0.194$. The spectroscopic results and the searches of methyl ketene in Orion will be presented. \_x000d_ em{This work was supported by the CNES and the Action sur Projets de l'INSU, PCMI. This work was also done under ANR-13-BS05-0008-02 IMOLABS}
Issue Date:6/21/2017
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:CONFERENCE PAPER/PRESENTATION
Type:Text
Language:English
URI:http://hdl.handle.net/2142/96874
DOI:10.15278/isms.2017.WF09
Date Available in IDEALS:2017-07-27


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