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

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

2012-03-22

arxiv.org/abs/1203.4877v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Accepted by A&A. 5 pages, 1 figure

Scientific paper

Rate coefficients for inelastic Mg+H collisions are calculated for all transitions between the lowest seven levels and the ionic state (charge transfer). 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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