Jena 2013 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 19: Poster: Theorie und Modellierung
P 19.4: Poster
Donnerstag, 28. Februar 2013, 14:00–16:00, Poster EG
Quantum-statistical line shape calculations for dense H and H-like plasmas — •Sonja Lorenzen1, Heidi Reinholz1, Gerd Röpke1, Mark C. Zammit2, Dmitry V. Fursa2, and Igor Bray2 — 1Institut für Physik, Universität Rostock, 18051 Rostock, Germany — 2Institute of Theoretical Physics, Curtin University, Perth WA 6845, Australia
Pressure broadening of spectral lines due to surrounding charged particles can be used as a diagnostic tool to determine temperature and electron density of a dense plasma. We apply a quantum-statistical theory to line shapes of Lyman lines of H and H-like emitters (Li2+).
The electronic self-energy describes the influence of plasma electrons on bound state properties and is therefore a crucial quantity. The effect of strong, i.e. close, electron-emitter collisions is considered with the help of an effective two-particle T-matrix. The T-matrix is calculated with a convergent close coupling code taking into account Debye screening. There, different magnetic quantum numbers and spin channels (singlet, triplet) can be distinguished contrary to our standard Born approximation for the electronic self-energy. For H, the effect of screening is analysed exemplary for kBT=1 eV and ne=1025 m−3, where width and shift are drastically reduced by the screening.
The ionic self-energy is based on the Stark effect often taken into account only statically. Here, the importance of ion-dynamics is investigated with the help of two different models, namely the model microfield method and the frequency fluctuation model, for different temperatures (T=104−107 K) and densities (ne=1023−1026 m−3).