Results 31 to 40 of about 75 (42)

Self-consistent approach for the thermodynamics of ions in dense plasmas in the superconfiguration approximation

open access: closedJournal of Quantitative Spectroscopy and Radiative Transfer, 2003
Abstract We propose a new thermodynamic approach to ions in dense plasmas taking into account the screening by free electrons. The ions in fundamental and excited states are represented by a group of superconfigurations. Each superconfiguration containing an integer number of bound electrons is totally screened by free electrons in a Wigner–Seitz (WS)
Thomas Blenski, Jean-Christophe Pain
openaire   +3 more sources

Effective superconfiguration temperature and the radiative properties of nonlocal thermodynamical equilibrium hot dense plasma

open access: closedPhysics of Plasmas, 2005
The model of superconfiguration (SC) temperatures has been used extensively for computing the population dynamics of very large systems in hot dense plasmas. Plasmas of Ge, Xe, and Au have been studied for a wide range of values of Te and Ne. For plasmas containing a distribution of a dozen of ionization states, two systems of a few hundreds of linear ...
J. Bauche   +2 more
openaire   +3 more sources

Chemical‐Picture‐Based Modeling of Thermodynamic Properties of Dense Multicharged‐Ion Plasmas Using the Superconfiguration Approach

open access: closedContributions to Plasma Physics, 2009
AbstractUsing the chemical‐picture representation of plasmas as a mixture of various ions and free electrons, a consistent description of thermodynamics of dense multicharged‐ion plasmas is being developed that involves the effects of Coulomb non‐ideality and degeneracy of plasma electrons; contribution of the excited ion states (on the base of the ...
A.A. Shadrin, P.A. Loboda, V.V. Popova
openaire   +3 more sources

Operator technique for calculating superconfiguration-averaged quantities of atoms in plasmas

open access: closedPhysical Review E, 1997
An operator technique for performing superconfiguration averages is presented. This technique is applicable in the calculation of local thermodynamic equilibrium (LTE) spectral moments as well as average rates for the various atomic processes in non-LTE collisional radiative models.
A. Bar-Shalom, M. Klapisch, J. Oreg
openaire   +3 more sources

A self-consistent model for the study of electronic properties of hot dense plasmas in the superconfiguration approximation

open access: closedJournal of Quantitative Spectroscopy and Radiative Transfer, 2006
We propose a thermodynamically consistent model involving detailed screened ions, described by superconfigurations, in plasmas. In the present work, the electrons, bound and free, are treated quantum-mechanically so that resonances are carefully taken into account in the self-consistent calculation of the electronic structure of each superconfiguration.
Jean-Christophe Pain   +2 more
openaire   +3 more sources

The effect of first order superconfiguration energies on the opacity of hot dense matter

open access: closedHigh Energy Density Physics, 2015
Abstract We have recently completed developing a new super transition array (STA) code for calculating absorption and emission spectra of LTE plasmas. The code follows the theory of Bar-Shalom et al. with various improvements. In this work we focus on the first order correction for the Boltzmann populations for which traditional calculations can be ...
Menahem Krief, Alexander Feigel
openaire   +3 more sources

Calculation of plasma transmission spectra using the superconfiguration method with orbital relaxation effects

open access: closedJournal of Quantitative Spectroscopy and Radiative Transfer, 1997
Abstract We describe a program developed at CEA Limeil-Valenton for the calculation of absorption spectra. This program is based on the idea of the Superconfiguration method proposed by Bar-Shalom et al. and implemented in their Super Transition Arrays code (STA).
A. Grimaldi   +3 more
openaire   +3 more sources

Superconfiguration accounting approach versus average-atom model in local-thermodynamic-equilibrium highly ionized plasmas

open access: closedPhysical Review E, 1999
Statistical methods of describing and simulating complex ionized plasmas requires the development of reliable and computationally tractable models. In that spirit, we propose the screened-hydrogenic average atom, augmented with corrections resulting from fluctuations of the occupation probabilities around the mean-field equilibrium, as an approximation
G. Faussurier
openaire   +4 more sources

Effect of Continuum Electrons on Superconfiguration Electronic Structure

open access: closed, 2022
Charles Starrett   +2 more
openaire   +2 more sources

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