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Inelastic Mg plus H collision data for non-LTE applications in stellar atmospheres

Abstract : Rate coefficients for inelastic Mg+H collisions are calculated for all transitions between the lowest seven levels and the ionic state (charge transfer), namely Mg(3s(2) S-1, 3s3p P-3, 3s3p P-1, 3s4s S-3, 3s4s S-1, 3s3d D-1, 3s4p P-3)+H(1s) and Mg+(3s S-2)+H-. The rate coefficients are based on cross-sections from full quantum scattering calculations, which are themselves based on detailed quantum chemical calculations for the MgH molecule. 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 various uncertainties in the calculations, most importantly input quantum chemical data and the numerical accuracy of the scattering calculations, a measure of the possible uncertainties in the rate coefficients is estimated.
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Contributor : Marie Guitou <>
Submitted on : Tuesday, August 28, 2012 - 11:43:09 AM
Last modification on : Monday, December 14, 2020 - 9:51:15 AM

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P. S. Barklem, A. K. Belyaev, Marie Guitou, A. Spielfiedel, N. Feautrier. Inelastic Mg plus H collision data for non-LTE applications in stellar atmospheres. Astronomy and Astrophysics - A&A, EDP Sciences, 2012, 541, pp.A80. ⟨10.1051/0004-6361/201219081⟩. ⟨hal-00725907⟩



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