Atomic data on inelastic processes in low-energy beryllium-hydrogen collisions ⋆
1 Max-Planck Institute for
2 Department of Theoretical Physics and Astronomy, Herzen University, 191186 St. Petersburg, Russia
Accepted: 4 June 2016
Aims. Inelastic processes in low-energy Be + H and Be+ + H− collisions are treated for the states from the ground and up to the ionic state with the aim to provide rate coefficients needed for non-local thermodynamic equilibrium (non-LTE) modeling of beryllium spectra in cool stellar atmospheres.
Methods. The electronic molecular structure is determined by using a recently proposed model quantum approach that is based on an asymptotic method. Nonadiabatic nuclear dynamics is treated by means of multichannel formulas, based on the Landau-Zener model for nonadiabatic transition probabilities.
Results. The cross sections and the rate coefficients for inelastic processes in Be + H and Be+ + H− collisions are calculated for all transitions between 13 low-lying covalent states plus the ionic state. It is shown that the highest rate coefficient values correspond to the mutual neutralization processes with the final states Be(2s3s 1S), Be(2s3p 1,3P), Be(2s3d 3D). These processes, as well as some of the excitation, de-excitation and ion-pair formation processes, are likely to be important for non-LTE modeling.
Key words: atomic data / line: formation / atomic processes
Tables A.1–A.10 are also available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (220.127.116.11) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/593/A27
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