Torsional-rotational spectrum of doubly deuterated dimethyl ether (CH3OCHD2): First ALMA detection in the interstellar medium
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Torsional-rotational spectrum of doubly deuterated dimethyl ether (CH3OCHD2) : First ALMA detection in the interstellar medium. / Richard, C.; Jorgensen, J. K.; Margules, L.; Motiyenko, R. A.; Guillemin, J. -C.; Groner, P.
In: Astronomy & Astrophysics, Vol. 651, A120, 28.07.2021.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Torsional-rotational spectrum of doubly deuterated dimethyl ether (CH3OCHD2)
T2 - First ALMA detection in the interstellar medium
AU - Richard, C.
AU - Jorgensen, J. K.
AU - Margules, L.
AU - Motiyenko, R. A.
AU - Guillemin, J. -C.
AU - Groner, P.
PY - 2021/7/28
Y1 - 2021/7/28
N2 - 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-d(2)-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.
AB - 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-d(2)-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.
KW - molecular data
KW - submillimeter: ISM
KW - ISM: molecules
KW - astrochemistry
KW - MICROWAVE-SPECTRA
KW - MOLECULES
KW - SPECTROSCOPY
KW - FORMALDEHYDE
KW - ABUNDANCE
KW - METHANOL
KW - STATES
U2 - 10.1051/0004-6361/202141282
DO - 10.1051/0004-6361/202141282
M3 - Journal article
VL - 651
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
SN - 0004-6361
M1 - A120
ER -
ID: 276215426