J/A+A/625/A78ivo://CDS.VizieR/J/A+A/625/A78doi:10.26093/cds/vizier.36250078CDSAmarsi A.M.Barklem P.S.2019-06-06T05:10:08Z2019-05-17T11:48:43ZCDS support team

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

cds-question@unistra.fratomic-physicsLow-energy inelastic collisions with neutral hydrogen atoms are important processes in stellar atmospheres, and a persistent source of uncertainty in non-LTE modelling of stellar spectra. We calculate and study excitation and charge transfer of CI and of NI due to such collisions. We use a previously presented method that is based on an asymptotic two-electron linear combination of atomic orbitals (LCAO) model of ionic-covalent interactions for the adiabatic potential energies, combined with the multichannel Landau- Zener model for the collision dynamics. We find that charge transfer processes typically lead to much larger rate coefficients than excitation processes, consistent with studies of other atomic species. Two-electron processes were considered and lead to non-zero rate coefficients that can potentially impact statistical equilibrium calculations. However, they were included in the model in an approximate way, via an estimate for the two-electron coupling that was presented earlier in the literature: the validity of these data should be checked in a future work.2019A&A...625A..78Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/625/A78CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/622/L4 : Carbon and oxygen in metal-poor halo stars (Amarsi+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/625/A78https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/625/A78http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/625/A78https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/625/A78https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/625/A78http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/625/A78GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/625/A78/c-stateCarbon statesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintiState indexmeta.idintLabelState configuration and termphys.atmol.configurationcharEAC atomic/ionic level energyeVphys.energy;phys.atmol.leveldoubleEcov? CH state energyeVphys.energy;phys.atmol.leveldoublenullableJ/A+A/625/A78/n-stateNitrogen statesiState indexmeta.idintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLabelState configuration and termphys.atmol.configurationcharEAC atomic/ionic level energyeVphys.energy;phys.atmol.leveldoubleEcov? CH state energyeVphys.energy;phys.atmol.leveldoublenullableJ/A+A/625/A78/c-rateRate coefficients for carboni2Final state indexmeta.idintTTemperatureKphys.temperatureintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinti1Initial state indexmeta.idintqRate coefficientcm**3.s**-1arith.ratedoubleJ/A+A/625/A78/n-rateRate coefficients for nitrogenrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinti1Initial state indexmeta.idinti2Final state indexmeta.idintTTemperatureKphys.temperatureintqRate coefficientcm**3.s**-1arith.ratedouble