Volume 591, July 2016
|Number of page(s)||5|
|Section||Atomic, molecular, and nuclear data|
|Published online||17 June 2016|
The millimeter wave spectrum of methyl cyanate: a laboratory study and astronomical search in space⋆,⋆⋆
1 Grupo de Espectroscopia Molecular (GEM), Edificio Quifima, Área de Química-Física, Laboratorios de Espectroscopia y Bioespectroscopia, Parque Científico UVa, Unidad Asociada CSICUniversidad de Valladolid, 47011 Valladolid, Spain
2 Instituto de Ciencia de Materiales de Madrid, CSIC, C/ Sor Juana Inés de la Cruz 3, 28049 Cantoblanco, Spain
3 Institut des Sciences Chimiques de Rennes, École Nationale Supérieure de Chimie de Rennes, CNRS, UMR 6226, 11 Allée de Beaulieu, CS 50837, 35708 Rennes Cedex 7, France
Received: 15 January 2016
Accepted: 15 March 2016
Aims. The recent discovery of methyl isocyanate (CH3NCO) in Sgr B2(N) and Orion KL makes methyl cyanate (CH3OCN) a potential molecule in the interstellar medium. The aim of this work is to fulfill the first requirement for its unequivocal identification in space, i.e. the availability of transition frequencies with high accuracy.
Methods. The room-temperature rotational spectrum of methyl cyanate was recorded in the millimeter wave domain from 130 to 350 GHz. All rotational transitions revealed A-E splitting owing to methyl internal rotation and were globally analyzed using the ERHAM program.
Results. The data set for the ground torsional state of methyl cyanate exceeds 700 transitions within J′′ = 10−35 and K"a= 0−13 and newly derived spectroscopic constants reproduce the spectrum close to the experimental uncertainty. Spectral features of methyl cyanate were then searched for in Orion KL, Sgr B2(N), B1-b, and TMC-1 molecular clouds. Upper limits to the column density of methyl cyanate are provided.
Key words: astrochemistry / line: identification / techniques: spectroscopic / astronomical databases: miscellaneous / molecular data
Tables 3 and 4 are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (188.8.131.52) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/591/A75
© ESO, 2016
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