Abstract
The emissivities of a plane layer and a hemispherical volume and also the Planck and Rosseland mean values of a sodium plasma are calculated in the range of temperatures 1000–20,000 K and pressures 0.1–20 bar. In determination of the spectral coefficient of absorption the entire spectral interval in which the main part of radiant energy is transferred is taken into account, and also the most important radiation processes that are associated with free-free, bound-free, and bound-bound transitions are considered. For the first time, the effect of internal microfields in the plasma is taken into account, thus allowing a correct calculation of the populations of excited states, shift of ionization equilibrium, and a smooth transition of the line spectrum into a continuous one in the near-threshold regions.
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