J/A+A/609/A24 Rotational spectrum of methoxyamine (Kolesnikova+, 2018)
Rotational spectrum of methoxyamine up to 480 GHz:
a laboratory study and astronomical search.
Kolesnikova L., Tercero B., Alonso E.R., Guillemin J.-C., Cernicharo J.,
Alonso J.L.
<Astron. Astrophys. 609, A24 (2018)>
=2018A&A...609A..24K 2018A&A...609A..24K (SIMBAD/NED BibCode)
ADC_Keywords: Interstellar medium ; Spectroscopy
Keywords: astrochemistry - ISM: molecules - line: identification -
astronomical databases: miscellaneous -
Abstract:
Methoxyamine is a potential interstellar amine that has been predicted
by gas-grain chemical models for the formation of complex molecules.
The aim of this work is to provide direct experimental frequencies of
its ground-vibrational state in the millimeter and submillimeter-wave
regions to achieve its detection in the interstellar medium.
Methoxyamine was chemically liberated from its hydrochloride salt, and
its rotational spectrum was recorded at room temperature from 75 to
480GHz using the millimeter-wave spectrometer in Valladolid. Many
observed transitions revealed A-E splitting caused by the internal
rotation of the methyl group, which had to be treated with specific
internal rotation codes.
Over 400 lines were newly assigned for the most stable conformer of
methoxyamine, and a precise set of spectroscopic constants was
obtained. Spectral features of methoxyamine were then searched for in
the Orion KL, Sgr B2, B1-b, and TMC-1 molecular clouds. Upper limits
to the column density of methoxyamine were derived.
Description:
Observed rotational transitions of methoxyamine in the ground
torsional state.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 76 661 Observed rotational transitions of methoxyamine
in the ground torsional state
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1 I1 --- Sigma Symmetry number (1)
4- 6 I3 --- J' Upper state J quantum number
7- 9 I3 --- Ka' Upper state Ka quantum number
10- 12 I3 --- Kc' Upper state Kc quantum number
15- 17 I3 --- J" Lower state J quantum number
18- 20 I3 --- Ka" Lower state Ka quantum number
21- 23 I3 --- Kc" Lower state Kc quantum number
32- 41 F10.3 MHz FreqObs Observed transition frequency (2)
48- 53 F6.3 MHz O-C Observed minus calculated frequency (3)
58- 64 F7.4 MHz Sa Line strength for a-type transitions
70- 76 F7.4 MHz Sb Line strength for b-type transitions
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Note (1): The symmetry numbers sigma = 0 and 1 label the A and E transitions,
respectively.
Note (2): In case of the lines that are composed from degenerate asymmetric
rotor transitions, equal weights were assigned to the components of
these blends. Any other transitions that are accidentally blended,
such as those corresponding to the unrelated A and E components,
were not included in the fit.
Note (3): In case of the blended transitions, this value corresponds to the
difference between the observed and calculated central frequency.
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Acknowledgements:
Lucie Kolesnikova, lucie.kolesnikova(at)uva.es
(End) Lucie Kolesnikova [GEM, UVa, Spain], Patricia Vannier [CDS] 23-Oct-2017