J/A+A/543/A159ivo://CDS.VizieR/J/A+A/543/A159doi:10.26093/cds/vizier.35430159CDSAllard N.F.Kielkopf J.F.Spiegelman F.Tinetti G.Beaulieu J.P.2017-06-01T08:53:11Z2012-08-23T07:35:35ZCDS support team

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

cds-question@unistra.fratomic-physicsWe present new unified theory line profiles of neutral Na perturbed by H_2_ . We used a priori NaH_2_ potentials, transition dipole moments and validated pseudo-potentials as input to the line shape, and evaluated the profiles for temperatures and densities appropriate for modeling exoplanet and brown dwarf atmospheres. The theory for the resonance lines was compared with new laboratory spectra of sodium to test the validity of the potentials and resulting profiles. The Lorentzian function commonly used to approximate a collisional line profile in radiative transfer calculations is shown to be inadequate, except within a few halfwidths of the line center. In the far wing, the opacity caused by collisions may be several orders of magnitude greater than the extrapolation of the Lorentzian core.2012A&A...543A.159Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/543/A159CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/543/A159https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/543/A159http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/543/A159https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/543/A159https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/543/A159http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/543/A159GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/543/A159/table5Profile of the Na 3s-3p transition broadened by molecular hydrogen (Fig. 5 of the paper)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength0.1nmem.wlintIntAbsorption coefficient in arbitrary units (1)spect.line.intensitydoubleJ/A+A/543/A159/table6Profile of the Na 3s-3p transition broadened by molecular hydrogen (Fig. 6 of the paper)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelengthumem.wldoublesigmaAbsorption cross-section (1)cm**2phys.atmol.crossSectiondouble