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J/A+A/591/A75 Millimeter wave spectrum of methyl cyanate (Kolesnikova+, 2016)
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Beginning of ReadMe :J/A+A/591/A75 Millimeter wave spectrum of methyl cyanate (Kolesnikova+, 2016)
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The millimeter wave spectrum of methyl cyanate: a laboratory study and
astronomical search in space.
Kolesnikova L., Alonso J.L., Bermudez C., Alonso E.R., Tercero B.,
Cernicharo J., Guillemin J.-C.
<Astron. Astrophys. 591, A75 (2016)>
=2016A&A...591A..75K (SIMBAD/NED BibCode)
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ADC_Keywords: Interstellar medium ; Spectroscopy ; Atomic physics
Keywords: astrochemistry - line: identification - techniques: spectroscopic -
astronomical databases: miscellaneous - molecular data
Abstract:
The recent discovery of methyl isocyanate (CH_3_NCO) in Sgr B2(N) and
Orion KL makes methyl cyanate (CH_3_OCN) 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.
The room-temperature rotational spectrum of methyl cyanate was
recorded in the millimeter wave domain from 130 to 350GHz. All
rotational transitions revealed A-E splitting owing to methyl internal
rotation and were globally analyzed using the ERHAM program.
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.
Description:
Observed and predicted rotational transition frequencies of methyl
cyanate in the ground torsional state.