Investigation and modeling of radiation absorption processes and opacities in dense plasmas
Abstract
A variety of atomic processes contribute to absorption of radiation in dense plasmas. Most existing atomic data are for low density, high temperature plasmas. At high densities and low temperatures, realistic modeling to incorporate the important additional effects in order to generate atomic data in needed. This is addressed in the present work. The models and computer codes developed for the project includes effects of nonlinear screening, electron degeneracy, exchangecorrelation and ion interactions selfconsistently. These were applied to ions of specific configurations in dense plasmas and represent improvements over average atom models often used in dense plasma physics. The focus of this work is mainly on the boundbound, boundfree and freefree photoprocesses, the contribute to radiation absorption and opacity of dense, low temperature plasmas. We discuss a model to generate ionic distribution that is computationally faster than rate equation method. We also discuss a model to investigate the d.c. electron conduction in dense plasmas, which incorporates effects of multiple scattering and improves over the Ziman type model. These selfconsistent models and computer codes are very useful tools to generate large data bases for atomic processes contributing to radiation absorption and opacities in dense plasmas. Those data would be a useful input to simulation of radiative properties of dense plasmas in various laboratory and astrophysical conditions.
 Publication:

Final Report
 Pub Date:
 September 1990
 Bibcode:
 1990sfai.rept.....G
 Keywords:

 Computer Programs;
 Computerized Simulation;
 Dense Plasmas;
 Electron Plasma;
 Opacity;
 Plasma Radiation;
 Radiation Absorption;
 Astrophysics;
 Atomic Physics;
 Cold Plasmas;
 Data Bases;
 High Temperature Plasmas;
 Ion Scattering;
 Nonlinear Systems;
 Plasma Conductivity;
 Plasma Physics;
 Plasma Physics