Results 21 to 30 of about 75 (57)

Helioseismic inference of the solar radiative opacity. [PDF]

Nat Commun
Buldgen G, Pain JC, Cossé P, Blancard C, Gilleron F, Pradhan AK, Fontes CJ, Colgan J, Noels A, Christensen-Dalsgaard J, Deal M, Ayukov SV, Baturin VA, Oreshina AV, Scuflaire R, Pinçon C, Lebreton Y, Corbard T, Eggenberger P, Salmon S, Hakel P, Kilcrease DP.   +21 more
europepmc   +1 more source

Hybrid calculation of hot plasma radiative properties at local thermodynamic equilibrium involving energy levels, configurations and superconfigurations.

, 2012
In hot dense plasmas, most energy transfer is due to radiation. Therefore, the effects of opacity on structure and evolution of plasmas are quite important. Normally, detailed line by line calculation of plasma opacities give the most precise results, but sometimes requires such an amount of resources it is not tractable.
openaire   +1 more source

The temperature law for superconfigurations in non-LTE plasmas [PDF]

Journal of Quantitative Spectroscopy and Radiative Transfer, 2001
Abstract It is shown that, in non-LTE hot plasmas, the atomic processes tend to establish a temperature law, i.e., a decreasing-exponential law vs. energy, for the total atomic populations of the configurations within each superconfiguration (SC). The SCs are defined by the occupancy numbers of atomic shells.
C Bauche-Arnoult, J Bauché
exaly   +3 more sources

Superconfigurations and Super Transition Arrays [PDF]

, 2015
This chapter is a continuation of Chap. 6 in the sense that, for very complex ions, not only the number of levels is overwhelmingly large, but also the number of configurations. The concept of superconfiguration has been introduced for a proper gathering of configurations through the definition of supershells (collections of ordinary subshells).
Bauché Jacques, Bauche-Arnoult Claire, Peyrusse Olivier   +2 more
exaly   +3 more sources

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Variational theory of average-atom and superconfigurations in quantum plasmas

Physical Review E, 2007
Models of screened ions in equilibrium plasmas with all quantum electrons are important in opacity and equation of state calculations. Although such models have to be derived from variational principles, up to now existing models have not been fully variational.
Bogdan Cichocki
exaly   +3 more sources

Superconfiguration widths and their effects on atomic models

High Energy Density Physics, 2011
Abstract Superconfigurations are an important component of many of the collisional-radiative atomic models that are used to predict the properties of atoms and ions in non-local thermodynamic equilibrium (non-LTE) plasmas. In this paper, we investigate the statistical properties of superconfigurations and derive expressions for their approximate ...
Stephanie B. Hansen, Jacques Bauche, Claire Bauche-Arnoult   +2 more
exaly   +2 more sources

Non-LTE superconfiguration collisional radiative model

Journal of Quantitative Spectroscopy and Radiative Transfer, 1997
Abstract We have developed a non-LTE collisional radiative model which takes into account the overwhelming multiplicity of excited levels of heavy elements in hot and dense plasmas. The model, ‘SCROLL’ (Super Configuration Radiative cOLLisional), treats superconfigurations as effective levels and reproduces detailed configuration accounting results ...
M Klapisch, A Bar-Shalom, J Oreg
exaly   +2 more sources

VirtualSpectro: a non-LTE post processor with superconfigurations and its application to a Xe-filled Be hohlraum

Journal of Quantitative Spectroscopy and Radiative Transfer, 2001
Abstract VirtualSpectro a post-processor that has the possibility of dealing with complex spectra by using superconfigurations (SC) as basis is described. The atomic data are extracted from SCROLL. In the coupling between the two codes, several problems were encountered: the SC basis set of SCROLL depends on temperature and density, and the number of
M Klapisch, M Busquet, A Bar-Shalom
exaly   +2 more sources

Variational approach to the average-atom-in-jellium and superconfigurations-in-jellium models with all electrons treated quantum-mechanically

High Energy Density Physics, 2007
Abstract Models of average-atom- and superconfigurations-in-plasmas with full quantum description of all electrons are important in opacity and EOS calculations, especially in case of high density plasmas in which pressure ionization phenomena can occur.
Bogdan Cichocki
exaly   +2 more sources

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

Journal 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.
T Blenski
exaly   +2 more sources