J/A+A/651/A120ivo://CDS.VizieR/J/A+A/651/A120doi:10.26093/cds/vizier.36510120CDSRichard C.Jorgensen J.K.Margules L.Motiyenko R.A.Guillemin J.C.,Groner P.2022-01-17T11:29:32Z2021-07-28T07:17:18ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.fratomic-physicsIn 2013, we have published the first rotational analysis and detection of mono-deuterated dimethyl ether in the solar-type protostar IRAS 16293-2422 with the IRAM 30m telescope. Dimethyl ether is one of the most abundant complex organic molecules (COMs) in star-forming regions and their D-to-H (D/H) ratios is important to understand its chemistry and trace the source history. 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 molecules with internal rotors. The analysis covers the frequency range 0.15-1.5THz. The laboratory rotational spectrum of this species was measured between 150 and 1500GHz with the Lille's submillimeter spectrometer. For the astronomical detection, we used the Atacama Large Millimeter/submillimeter Array (ALMA) observations from the Protostellar Interferometric Line Survey, PILS. 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 16293-2422.2021A&A...651A.120Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/651/A120CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/651/A120https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/651/A120http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/651/A120https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/651/A120https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/651/A120http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/651/A120GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/651/A120/tablea1Experimental frequencies measured in laboratory up to 1.5THz for the symmetric conformerKa1Ka value of the upper statephys.mol.qnintJ1J value of the upper statestat.value;phys.atmol.configurationintKc1Kc value of the upper statephys.mol.qnintFreqMeasured frequencyem.freqdoubleAccAccuracy of the measurestat.errorfloatO-CObserved-calculated frequencystat.fit.residualfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsig[0/1] Symmetry number {sigma}: 0(A), 1(E)phys.atmolintJ0J value of the lower statestat.value;phys.atmol.configurationintKa0Ka value of the lower statephys.mol.qnintKc0Kc value of the lower statephys.mol.qnintJ/A+A/651/A120/tablea2Experimental frequencies measured in laboratory up to 1.5THz for the asymmetric conformerKa1Ka value of the upper statephys.mol.qnintKc1Kc value of the upper statephys.mol.qnintFreqMeasured frequencyem.freqdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsig[0/1] Symmetry number {sigma}: 0(A), 1(E)phys.atmolintJ0J value of the lower statestat.value;phys.atmol.configurationintKa0Ka value of the lower statephys.mol.qnintKc0Kc value of the lower statephys.mol.qnintJ1J value of the upper statestat.value;phys.atmol.configurationintAccAccuracy of the measurestat.errorfloatO-CObserved-calculated frequencystat.fit.residualfloatJ/A+A/651/A120/tableb1Predicted transition frequencies of doubly-deuterated DME in the ground-vibrational state for the symmetric conformerFreqPredicted frequencyem.freqdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsig[0/1] Symmetry number {sigma}: 0(A), 1(E)phys.atmolintJ0J value of the lower statestat.value;phys.atmol.configurationintKa0Ka value of the lower statephys.mol.qnintKc0Kc value of the lower statephys.mol.qnintJ1J value of the upper statestat.value;phys.atmol.configurationintKa1Ka value of the upper statephys.mol.qnintKc1Kc value of the upper statephys.mol.qninte_FreqUncertainty of the predictionstat.errorfloatSpin[4] Spin weightstat.weight;phys.atmolintSLine strength for the dipole {mu}_b_ componentspect.line.intensityfloatE'Value of the upper energy levelphys.energy;phys.atmol.leveldoubleJ/A+A/651/A120/tableb2Predicted transition frequencies of doubly-deuterated DME in the ground-vibrational state for the asymmetric conformerrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsig[0/1] Symmetry number {sigma}: 0(A), 1(E)phys.atmolintJ0J value of the lower statestat.value;phys.atmol.configurationintKa0Ka value of the lower statephys.mol.qnintKc0Kc value of the lower statephys.mol.qnintJ1J value of the upper statestat.value;phys.atmol.configurationintKa1Ka value of the upper statephys.mol.qnintKc1Kc value of the upper statephys.mol.qnintFreqPredicted frequencyem.freqdoublee_FreqUncertainty of the predictionstat.errorfloatSpin[4] Spin weightstat.weight;phys.atmolintSLine strength for the dipole {mu}_b_ componentspect.line.intensityfloatE'Value of the upper energy levelphys.energy;phys.atmol.leveldouble