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J/A+A/538/A119 ^18^O isotopic species of methyl formate data (Tercero+, 2012)
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Beginning of ReadMe :J/A+A/538/A119 Spectrum of ^18^O-methyl formate (HCO^18^OCH_3_) (Tercero+ 2012)
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Microwave and sub-mm spectroscopy and first ISM detection of 18O-methyl formate.
Tercero B., Margules L., Carvajal M., Motiyenko R.A., Huet T.R.,
Alekseev E.A., Kleiner I., Guillemin J.C., Mollendal H., Cernicharo J.
<Astron. Astrophys. 538, A119 (2012)>
=2012A&A...538A.119T
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ADC_Keywords: Interstellar medium ; Spectroscopy
Keywords: astrochemistry - ISM: molecules - submillimeter: ISM -
line: identification - astronomical databases: miscellaneous -
ISM: individual objects: Orion KL
Abstract:
Astronomical survey of interstellar molecular clouds needs a previous
analysis of the spectra in the microwave and sub-mm energy range of
organic molecules in order to be able to identify them. Very accurate
spectroscopic constants are obtained in a comprehensive laboratory
analysis of rotational spectra. These constants can be used to predict
with very high precision the frequencies of transitions that have not
been measured in the laboratory.
In this work, an experimental study and its theoretical analysis is
presented for two ^18^O-methyl formate isotopologues in order to detect
for the first time both isotopologues in Orion KL. The experimental
spectra of both isotopologues of methyl formate have been recorded in
the microwave and sub-mm energy range from 1 to 660GHz. Both spectra
have been analysed by using the Rho-Axis Method (RAM) which takes into
account the CH3 internal rotation. Spectroscopic constants of both
^18^O-methyl formate have been obtained with high accuracy. Thousands
of transitions were assigned and others predicted, which allowed us to
detect both species in the IRAM 30m line survey of Orion KL for the
first time in the space.
Description:
The two ^18^O isotopic species of methyl formate were measured and
analysed up to 660GHz. The treatment of the internal rotation motion
was made using the Rho-Axis- Method and the BELGI code. 4430 and 3258
lines are assigned for the ground torsional states from the
HCO^18^OCH_3_ and HC^18^OOCH_3_ species, respectively. From these
spectral analysis, accurate predictions of line positions and
intensities are performed.