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Partial ionization in dense plasmas: comparisons among average-atom density functional models.

Michael S Murillo1, Jon Weisheit, Stephanie B Hansen

  • 1Computational Physics and Methods Group, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. murillo@lanl.gov

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|July 16, 2013
PubMed
Summary
This summary is machine-generated.

The mean ionization state (MIS) concept in dense plasmas is crucial for simplifying calculations but lacks a universal definition. This study compares different MIS models, revealing how shell structure and electron interactions influence results for Be, Al, and Cu plasmas.

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Area of Science:

  • Plasma Physics
  • Computational Physics
  • Atomic Physics

Background:

  • Dense plasmas exhibit complex electronic structures and ionic ordering.
  • The mean ionization state (MIS) simplifies plasma property calculations but lacks a unique definition.
  • Various statistical models define MIS differently, impacting plasma simulations.

Purpose of the Study:

  • To compare numerical results of different MIS formulations for Be, Al, and Cu plasmas.
  • To quantify the influence of shell structure, continuum resonances, and exchange-correlation effects on MIS.
  • To evaluate the impact of model choices (orbital-based vs. orbital-free) on plasma properties.

Main Methods:

  • Utilized density functional theory (DFT) based average-atom models.
  • Compared orbital-based and orbital-free Thomas-Fermi models.
  • Analyzed plasma conditions including incomplete ionization and partial electron degeneracy.

Main Results:

  • Quantified discrepancies between orbital-based and Thomas-Fermi models for MIS.
  • Demonstrated the significant role of shell structure and continuum resonances.
  • Illustrated MIS application in X-ray Thomson scattering for warm dense matter.

Conclusions:

  • The choice of MIS definition significantly impacts plasma property calculations.
  • Modern DFT-based models provide a more nuanced understanding of plasma behavior.
  • Accurate MIS determination is vital for applications like X-ray Thomson scattering.