J/A+A/605/A95ivo://CDS.VizieR/J/A+A/605/A95doi:10.26093/cds/vizier.36050095CDSYurchenko S.N.Amundsen D.S.Tennyson J.Waldmann I.P.2018-01-22T07:09:42Z2017-09-18T12:37:36ZCDS support team

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

cds-question@unistra.fratomic-physicsA line list for methane (CH_4_) is constructed as a combination of 17 million strong absorption lines relative to the reference absorption spectra and a background methane continuum in two temperature-dependent forms of cross sections and super-lines. This approach significantly eases the use of large high temperature line lists as the computationally expensive calculation of pressure-dependent profiles (e.g. Voigt) only need to be performed for a relatively small number of lines. Both the line list and cross sections were generated using a new 34 billion methane line list (known as 34to10), which extends the 10to10 line list to higher temperatures (up to 2000K). The new hybrid scheme can be applied to any large line lists containing billions of transitions. We recommend using super-lines generated on a high resolution grid based on a resolving power of R=1000000 to model the molecular continuum as a more flexible alternative to the temperature-dependent cross sections.2017A&A...605A..95Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/605/A95CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/757/46 : Hot methane (CH_4_) line list (Hargreaves+, 2012)J/MNRAS/440/1649 : ExoMol line lists for CH_4_ (Yurchenko+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/605/A95https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/605/A95http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/605/A95https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/605/A95https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/605/A95http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/605/A95GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/605/A95/ch4_e50Labelled rovibrational statesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintiState ID, non-negative integer index starting at 1meta.idEState energy term value in cm-1cm**-1phys.energy;phys.atmol.leveldoublegTotal state degeneracyphys.electron.degenintJ[0/50] J-quantum number J is the total angular momentum excluding nuclear spinmeta.number;phys.atmol.sWeight.nuclearintG[1/5] Total symmetry in T_d_(M), Gamma = A1, A2, E, F1, F2phys.atmol.parityintn1[0/10] A1-symmetry normal mode quantum number (QN)phys.atmol.qnintn2[0/20] E-symmetry normal mode QNphys.atmol.qnintL2[0/20] L2 vibrational angular momentum QNphys.mol.qnintn3[0/10] F1-symmetry normal mode QNphys.atmol.qnintL3[0/10] L3 vibrational angular momentum QNphys.mol.qnintM3[0/10] M3 Multiplicity index QNmeta.code.multipintn4[0/20] F2-symmetry normal mode QNphys.atmol.qnintL4[0/20] L4 vibrational angular momentum QNphys.mol.qnintM4[0/20] M4 Multiplicity index QNmeta.code.multip;spect.indexintGv[1/5] Td(M) vibrational symmetry {GAMMA}(v) (local mode)phys.atmol.parityintJ2[0/50] Total angular momentum quantum number Same column as Jphys.atmol.qnintK[0/50] Projection of J on axis of molecular symmetrymeta.noteintPr[0/1] Rotational parity tau(rot)phys.atmol.parity;phys.mol.rotationintGrot[1/5] Td(M) rotational symmetry {GAMMA}(rot)phys.atmol.parityintNBl[1/9997054] Reference number in the blockmeta.id;meta.mainintC2[0.0/1.00] Square of the largest coefficientmeta.notefloatv1[0/10] Local mode vibrational quantum numberphys.mol.qnintv2[0/10] Local mode vibrational QNphys.mol.qnintv3[0/10] Local mode vibrational QNphys.mol.qnintv4[0/10] Local mode vibrational QNphys.mol.qnintv5[0/20] Local mode vibrational QNphys.mol.qnintv6[0/20] Local mode vibrational QNphys.mol.qnintv7[0/20] Local mode vibrational QNphys.mol.qnintv8[0/20] Local mode vibrational QNphys.mol.qnintv9[0/20] Local mode vibrational QNphys.mol.qnintJ/A+A/605/A95/broadLine broadening parameters gamma0 and n0 defining the Voigt profileJ"Lower state rotational quantum number J"phys.atmol.configurationintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypea0-type, see definition in Tennyson, 2016, J. Mol. Spectrosc., 327, 73meta.code;phys.atmol.transitionchargamma0Voigt gamma parameter (CH_4_)cm**-1phys.atmolfloatnTemperature exponent (CH_4_)arith.factordouble