Abstract
The populations of the excited and ionized states in an ionized nitrogen gas are calculated for various steady state non-local thermodynamic equilibrium (NLTE) situations. The non-equilibrium conditions basically result from the low electron densities (10 11−10 18 e/ cm 3) considered. A model consisting of 26 energy levels is assumed for the ions N I-N VIII. The optically thin gas is assumed to be maintained at a fixed electron temperature and is irradiated by an external Planckian field weakened by a dilution factor, W. Specific densities and temperatures for which LTE holds (for the particle occupations) in N are presented. The electrons are assumed to have a Maxwellian distribution. The populations are presented for electron temperatures between 10 4 and 10 6 °K for various W's.
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