J/ApJ/500/1059ivo://CDS.VizieR/J/ApJ/500/1059doi:10.26093/cds/vizier.15001059CDSGroner P.Albert S.Herbst E.De Lucia F.C.1999-06-19T21:17:22Z1999-06-19T21:16:37ZCDS support team

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

cds-question@unistra.frinterstellar-mediumatomic-physicsDimethyl ether (CH_3_OCH_3_) is a well-known interstellar molecule with a large abundance in hot core regions. We have measured many rotational-torsional transition lines of this molecule in the 100-550GHz frequency range using two experimental techniques: a klystron-based traditional millimeter-wave spectrometer and a new fast scan spectrometer (designated "FASSST") with a voltage-tunable backward wave oscillator. The lines arising from the ground vibrational state have been combined with previous data, mainly at lower frequencies, to form a global data set consisting of over 1600 lines that have been assigned and fitted by an effective Hamiltonian method. The spectral constants obtained from the fit allow us to predict the frequencies of almost 6000 additional lines of dimethyl ether through 600GHz.1998ApJ...500.1059Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/500/1059CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/499/517 : Ethylene oxide spectrum (Pan+, 1998)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/500/1059https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/500/1059http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/500/1059https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/500/1059https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/500/1059http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/500/1059GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/500/1059/table1Assigned and Fitted Transition Frequencies of Dimethyl Ether in the Ground Vibrational StaterecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinttTorsional substates (1)phys.atmol.qnintJ'J' rotational quantum numberphys.atmol.qnintK'aK'a rotational quantum numberphys.atmol.qnintK'cK'c rotational quantum numberphys.atmol.qnintJ"J" rotational quantum numberphys.atmol.qnintK"aK"a rotational quantum numberphys.atmol.qnintK"cK"c rotational quantum numberphys.atmol.qnintFreqFrequencyMHzem.freqdoubleO-CObserved minus calculated frequencyMHzem.freqfloate_Freq? rms uncertainty on Freq (2)MHzstat.errorfloatnullableSourceSource (3)meta.codecharJ/ApJ/500/1059/table3Predicted Transition Frequencies of Dimethyl Ether in the Ground Vibrational StaterecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinttTorsional substates (1)phys.atmol.qnintJ'J' rotational quantum numberphys.atmol.qnintK'aK'a rotational quantum numberphys.atmol.qnintK'cK'c rotational quantum numberphys.atmol.qnintJ"J" rotational quantum numberphys.atmol.qnintK"aK"a rotational quantum numberphys.atmol.qnintK"cK"c rotational quantum numberphys.atmol.qnintFreqFrequencyMHzem.freqdoublee_Freqrms uncertainty on FreqMHzstat.errorfloatWSpinSpin weightstat.weight;phys.atmolintSS value (Townes & Schawlow, 1975, Microwave Spectroscopy (New York: Dover)))stat.paramdoubleEuUpper state energiescm**-1phys.energy;phys.mol.vibrationfloat