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Rate coefficients for inelastic collisions between Li and H atoms coveringall transitions between the asymptotic statesLi(2s,2p,3s,3p,3d,4s,4p,4d,4f)+H(1s) and Li^+ +H^- are presented for thetemperature range 2000-8000 K based on recent cross-section calculations. Thedata are of sufficient completeness for non-LTE modelling of the Li I 670.8 nmand 610.4 nm features in late-type stellar atmospheres. Non-LTE radiativetransfer calculations in both 1D and 3D model atmospheres have been carried outfor test cases of particular interest. Our detailed calculations show that theclassical modified Drawin-formula for collisional excitation and de-excitation(Li*+H <-> Li*'+H) over-estimates the cross-sections by typically severalorders of magnitude and consequently that these reactions are negligible forthe line formation process. However, the charge transfer reactions collisionalion-pair production and mutual neutralization (Li*+H <-> Li^+ +H^-) are ofimportance in thermalizing Li. In particular, 3D non-LTE calculations of the LiI 670.8 nm line in metal-poor halo stars suggest that 1D non-LTE resultsover-estimate the Li abundance by up to about 0.1 dex, aggrevating thediscrepancy between the observed Li abundances and the primordial Li abundanceas inferred by the WMAP analysis of the cosmic microwave background.Comment: A&A, in press (Letters to the editors), 4 page

Inelastic H+Li and H-+Li+collisions and non-LTE Li I line formation in stellar atmospheres

Inelastic H+Li and H^-+Li⁺collisions and non-LTE Li I line formation in stellar atmospheres