Accurate Collisional Cross-Sections: Important Non-Lte Input Data

Details Accurate Collisional Cross-Sections: Important Non-Lte Input Data Accurate Collisional Cross-Sections: Important Non-Lte Input Data

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010eas....43...79m&link_type=abstract

EAS Publications Series, Volume 43, 2010, Non-LTE Line Formation for Trace Elements in Stellar Atmospheres, Edited by R. Monier,

Computer Science

Scientific paper

Non-LTE modelling for a particular atom requires accurate collisional excitation and ionization cross-sections for the entire system of transitions in the atom. This review concerns with inelastic collisions with electrons and neutral hydrogen atoms. For the selected atoms, H i and Ca ii, comparisons are made between electron impact excitation rates from ab initio calculations and various theoretical approximations. The effect of the use of modern data on non-LTE modelling is shown. For most transitions and most atoms, hydrogen collisional rates are calculated using a semi-empirical modification of the classical Thomson formula for ionization by electrons. Approaches used to estimate empirically the efficiency of hydrogenic collisions in the statistical equilibrium of atoms are reviewed.
This research was supported by the Deutsche Forschungsgemeinschaft with grant 436 RUS 17/13/07.

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