Research Note

Inelastic Na+H collision data for non-LTE applications in stellar atmospheres

¹ Department of Physics and Astronomy, Uppsala University, Box 515, 75120 Uppsala, Sweden e-mail: Paul.Barklem@fysast.uu.se
² Department of Theoretical Physics, Herzen University, St. Petersburg 191186, Russia
³ School of Chemistry, Newcastle University, NE1 7RU Newcastle upon Tyne, UK
⁴ Laboratoire de Chimie et Physique Quantique, UMR 5626 du CNRS, IRSAMC, Université Paul Sabatier, 118 rte de Narbonne, 31062 Toulouse, France

Received: 4 June 2010
Accepted: 24 June 2010

Abstract

Rate coefficients for inelastic Na+H collisions are calculated for all transitions between the ten levels up to and including the ionic state (ion-pair production), namely Na(3s,3p,4s,3d,4p,5s,4d,4f,5p)+H(1s) and Na⁺+H^-. The calculations are based on recent full quantum scattering cross-section calculations. The data are needed for non-LTE applications in cool astrophysical environments, especially cool stellar atmospheres, and are presented for a temperature range of 500-8000 K. From consideration of the sensitivity of the cross-sections to input quantum chemical data and the results of different methods for the scattering calculations, a measure of the possible uncertainties in the rate coefficients is estimated.