CALCULATION OF THE INTEGRAL OPTICAL
CHARACTERISTICS OF A SODIUM PLASMA
S. S. Katsnel'son

UDC 536.45

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.

JEPTER7492020005
JEPTER749205