Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jqsrt..58..553d&link_type=abstract
Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 58, issue 4-6, pp. 553-558
Computer Science
1
Line Broadening: Plasma
Scientific paper
The existing analytical models of ion dynamical broadening, while working relatively well at high densities, become progressively more inaccurate at low densities. The authors have developed a new analytical model that is free from this shortcoming and is also simpler than most of its predecessors. This model is based on dynamic characteristics of the multi-particle ion microfield introduced by Chandrasekhar and von Neumann (1942, 1943). These characteristics are used for separating the entire ensemble of microfields into two parts that act differently on radiating atoms/ions: a dynamic part, that is then treated in the impact approximation, and the remaining part, treated in the quasistatic approximation. It turns out that this model not only is simpler and faster than the previous analytical models, but also is practically as accurate as simulation models. The comparison with the experiments shows that the authors' model is universal: it yields a good agreement with the experiments over five orders of magnitude density range where the experimental results are available.
Derevianko Andrei
Oks Eugene
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