Radiative Opacity Database Of Mixture Plasmas Using Detailed Level Accounting Model

Opacity is a quantity which determines the transport of radiation through matter,and remains a subject of current interest since they play an important role in the inertial confinement fusion?ICF?research as well as in stellar physics.Many plasmas of interest in ICF and astrophysics are made of several materials with different number fractions,therefore the study of their radiative properties and equation of state is of particular interest.The detailed level accounting model is a so-called line-by-line model,where the atomic configurations split into levels and each line in the transition array is calculated.In contrast to the statistical methods,the detailed level model account for all the transition lines corresponding to every ionic species in the plasma,they can calculate more accurate opacities so requires much more effort in computing atomic data.In this work,the required atomic data were obtained accuracy to the detailed fine-structure levels,where various physical effects such as configuration interaction?CI?and relativity are adequately taken into account.The ionization equilibrium is determined from the Saha equation and the excitation equilibrium is given by the Boltzmann distribution function.Ionization competition effects on the charge state population distribution and spectrally resolved and Planck and Rosseland mean radiative opacities of mixture plasmas at the same conditions of temperatures and mass densities,taking SiO₂ as an example.