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Title: Ionization competition effects on population distribution and radiative opacity of mixture plasmas

Ionization competition arising from the electronic shell structures of various atomic species in the mixture plasmas was investigated, taking SiO{sub 2} as an example. Using a detailed-level-accounting approximation, we studied the competition effects on the charge state population distribution and spectrally resolved and Planck and Rosseland mean radiative opacities of mixture plasmas. A set of coupled equations for ionization equilibria that include all components of the mixture plasmas are solved to determine the population distributions. For a given plasma density, competition effects are found at three distinct temperature ranges, corresponding to the ionization of M-, L-, and K-shell electrons of Si. Taking the effects into account, the spectrally resolved and Planck and Rosseland mean opacities are systematically investigated over a wide range of plasma densities and temperatures. For a given mass density, the Rosseland mean decreases monotonically with plasma temperature, whereas Planck mean does not. Although the overall trend is a decrease, the Planck mean increases over a finite intermediate temperature regime. A comparison with the available experimental and theoretical results is made.
Authors:
; ;  [1] ; ;  [1] ;  [2]
  1. Department of Physics, College of Science, National University of Defense Technology, Changsha, Hunan 410073 (China)
  2. (China)
Publication Date:
OSTI Identifier:
22489873
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CHARGE STATES; ELECTRON TEMPERATURE; ION TEMPERATURE; IONIZATION; K SHELL; L SHELL; M SHELL; OPACITY; PLASMA DENSITY; POPULATION DENSITY; SILICON OXIDES; TEMPERATURE RANGE