L to M shell transitions and model comparisons for radiative opacities of sodium fluoride plasma

Abstract

The radiative opacities of hot dense sodium fluoride (NaF) plasma have been studied in the case of local thermodynamic equilibrium (LTE). The spectrally resolved opacity in the case of T = 50 eV and ρ = 0.01 g / cm 3 is taken as an example to illustrate the absorption structures of the NaF plasma. The transitions from L to M shells of sodium and fluoride are the main contributions for the plasma absorptions. The isodense opacities of NaF plasma are studied at a density of 0.01 g / cm 3 and temperatures of 20–60 eV. Detailed comparisons among the results of the detailed term accounting (DTA), detailed configuraion accounting (DCA), unresolved transition array (UTA) and average atom (AA) model codes, which have been developed independently in China in the past few years, are performed for both the spectral resolved and mean opacities. Good agreements are found at a temperature of 40 eV and a density of 0.01 g / cm 3 , but discrepancies appear at a temperature of 50 eV and a density of 0.01 g / cm 3 .