Titre :

Torsional-rotational spectrum of doubly deuterated dimethyl ether (CH3OCHD2)
First ALMA detection in the interstellar medium

Auteur(s) :

Richard, C. [Auteur correspondant]
Laboratoire Interdisciplinaire Carnot de Bourgogne [ICB]
Jørgensen, J. K. [Auteur]
Margulès, L. [Auteur]
Physique Moléculaire aux Interfaces [PMI]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Motiyenko, R. A. [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Physique Moléculaire aux Interfaces [PMI]
Guillemin, J.-C. [Auteur]
Institut des Sciences Chimiques de Rennes [ISCR]
Groner, P. [Auteur]

Titre de la revue :

Astronomy & Astrophysics - A&A

Pagination :

A120

Éditeur :

EDP Sciences

Date de publication :

2021-07

ISSN :

0004-6361

Mot(s)-clé(s) en anglais :

molecular data
submillimeter: ISM
ISM: molecules
astrochemistry

Discipline(s) HAL :

Physique [physics]/Astrophysique [astro-ph]

Résumé en anglais : [en]

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 ...
Lire la suite >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.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Collections :

• Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM) - UMR 8523

Source :

Harvested from HAL