Non-LTE superconfiguration collisional radiative model.

Details Non-LTE superconfiguration collisional radiative model. Non-LTE superconfiguration collisional radiative model.

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jqsrt..58..427b&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 58, issue 4-6, pp. 427-439

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37

Radiative Transfer: Non-Lte Models, Radiative Transfer: Plasma

Scientific paper

The authors 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 by an iterative procedure which splits superconfiguration until convergence. The fundamental assumption in the model is that within a superconfiguration levels are populated according to Boltzmann statistics. This assumption is effectively relaxed by the convergence procedure. The populations of the superconfigurations are obtained by solving the set of collisional radiative rate equations. For this purpose the authors have derived analytical formulae for the average transition rates between superconfigurations for collisional excitation and ionization, radiative transitions, photoionization and autoionization. These analytical formulae are obtained using the "Partition Function Algebra" developed in the authors' previous LTE STA model. The calculation of the average rates are performed in the distorted wave approximation framework. Using the resulting superconfiguration populations the authors can then calculate charge distribution, opacities and emissivities. The model is applicable to any atom.

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