| Issue |
A&A
Volume 651, July 2021
|
|
|---|---|---|
| Article Number | A120 | |
| Number of page(s) | 10 | |
| Section | Atomic, molecular, and nuclear data | |
| DOI | https://doi.org/10.1051/0004-6361/202141282 | |
| Published online | 28 July 2021 | |
Torsional-rotational spectrum of doubly deuterated dimethyl ether (CH3OCHD2)
First ALMA detection in the interstellar medium★
1
Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS - Université Bourgogne Franche-Comté,
9 Av. A. Savary, BP 47870,
21078
Dijon Cedex,
France
e-mail: cyril.richard@u-bourgogne.fr
2
Niels Bohr institute, University of Copenhagen,
Øster Voldgade 5-7,
1350
Copenhagen K.,
Denmark
3
Univ. Lille, CNRS, UMR 8523 - PhLAM - Physique des Lasers Atomes et Molécules,
59000
Lille,
France
4
Univ Rennes, Ecole Nationale Supérieure de Chimie de Rennes, CNRS,
IRCR-UMR 6226,
35000
Rennes,
France
5
Department of Chemistry, University of Missouri-Kansas City,
Kansas City,
MO
64110-2499,
USA
Received:
10
May
2021
Accepted:
14
June
2021
Context. In 2013, we published the first rotational analysis and detection of mono-deuterated dimethyl ether in the solar-type protostar IRAS 16293-2422 with the IRAM 30 m telescope. Dimethyl ether is one of the most abundant complex organic molecules in star-forming regions, and its D-to-H (D/H) ratios are important to understand its chemistry and trace the source history.
Aims. We present the first analysis of doubly deuterated dimethyl ether (methoxy-d2-methane, 1,1-dideuteromethylether) in its ground-vibrational state, based on an effective Hamiltonian for an asymmetric rotor molecule with internal rotors. The analysis covers the frequency range 0.15–1.5 THz.
Methods. The laboratory rotational spectrum of this species was measured between 150 and 1500 GHz with Lille’s submillimeter spectrometer. For the astronomical detection, we used the Atacama Large Millimeter/submillimeter Array observations from the Protostellar Interferometric Line Survey.
Results. New sets of spectroscopic parameters have been determined by a least squares fit with the ERHAM code for both symmetric and asymmetric conformers. As for the mono-deuterated species, these parameters have permitted the first identification in space of both conformers of a doubly deuterated dimethyl ether via detection near the B component of the Class 0 protostar IRAS 16293-2422.
Key words: molecular data / submillimeter: ISM / ISM: molecules / astrochemistry
Full Tables A.1, A.2, B.1, and B.2, which respectively give the measured (in laboratory) and predicted frequencies, are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/651/A120
© C. Richard et al. 2021
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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