Greifswald 2009 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 18: Poster: Theorie/Modellierung
P 18.18: Poster
Mittwoch, 1. April 2009, 17:30–19:30, Foyer des IfP
Influence of reabsorption and trapping of radiation on the population of excited states in low-temperature plasma — •Sergey Gorchakov1, Dmitry Demchuk2, Yuri Golubovskii2, Detlef Loffhagen1, Alexander Timofeev2, and Dirk Uhrlandt1 — 1INP Greifswald, Felix-Hausdorff-Str. 2, D-17489 Greifswald, Germany — 2Saint-Petersburg State University, Ulyanovskaya 1, 198504 St. Petersburg, Russia
Reabsorption and trapping of radiation play an important role in gas discharge plasmas. The description of corresponding phenomena in numerical models follows from the solution of the radiation transport equation (Holstein-Biberman equation) [1]. The most promising solution method of this equation is the matrix method which is based on the transformation of the integral radiation transport operator into a system of linear algebraic equations. This contribution presents the further development of the matrix method. In particular, two situations have been considered: (i) the case of an inhomogeneous density distribution of absorbing atoms due to the gas heating, when the absorption coefficients which are dependent on the density of the ground state atoms and the width of the spectral line profile vary in space, and (ii) the case when the absorption coefficient is of the order of unity, i.e. the line profiles according to the relevant broadening mechanism have to be taken into account. First results are discussed and compared with those of conventional methods.
[1] T.Holstein, Phys. Rev. 72,1212 (1947); L. M. Biberman, Zh. Exp. Teor. Phys. 17, 416 (1947)