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P: Plasmaphysik
P 10: Poster II
P 10.12: Poster
Dienstag, 18. März 2003, 17:30–19:15, Foyer
An Adaptive Collisional Radiative Model: Theory and Applications for Low Temperature Plasmas — •D. Wünderlich1,2, U. Fantz1, and K. Behringer1,2 — 1Lehrstuhl für Experimentelle Plasmaphysik, Institut für Physik, Universität Augsburg, D-86135 Augsburg — 2Max-Planck-Institut für Plasmaphysik, D-85748 Garching, EURATOM Assoziation
The radiation of molecules and atoms can be used as a diagnostic method for the determination of plasma parameters. The population of one or more excited states can be predicted using a population model. Comparison with measured populations allows the determination of the plasma parameters (Te, ne, particle densities). Since low temperature plasmas are in non-equilibrium, collisional radiative (CR) models have to be applied. Often CR models are developed for one specific species under the assumption of a Maxwellian EEDF. In some cases it is difficult to add new reactions or change input data for existing reactions. Therefore a new, adaptive code for CR models was developed and applied to molecular hydrogen and helium. In the first case the model is based upon an already established model and demonstrates the easy handling of modifications on selected examples. In case of helium the CR model is based on cross sections and allows investigations on the influence of the EEDF on the population of the electronically excited states. For both models predicted populations are compared with spectroscopic results from low temperature plasmas in hydrogen and helium.