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[en] A new method for calculating the population of excited levels of helium atoms and ions is suggested. The method is based on direct solution of a system of balance equations for all energy levels for which it was possible to obtain process speed constants. The equations include terms for the processes of particle loss and income by excitation and deexcitation, ionization and recombination as well as losses due to diffusion and radiation. The challenge of solution of such large system is also discussed. (paper)
Journal
Journal of Physics. Conference Series (Online); ISSN 1742-6596; 
; v. 653(1); [5 p.]
; v. 653(1); [5 p.]