Results 31 to 40 of about 75 (42)
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
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
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
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
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
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
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
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
Charles Starrett+2 more
openaire +2 more sources
SCROLL, A Superconfiguration Collisional Radiative Model With External Radiation
A. Bar‐Shalom, M. Klapisch, J. Oreg
openalex