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P: Fachverband Plasmaphysik

P 4: Theory of Quantum Plasmas I

P 4.3: Vortrag

Montag, 17. März 2014, 14:45–15:00, SPA HS202

Quantum-statistical theory for plasma pressure broadening for H-like emitters — •Sonja Lorenzen — Institute of Physics, University of Rostock, D-18051 Rostock, Germany

To apply spectroscopy as a diagnostic tool for dense plasmas, a theoretical approach to pressure broadening is indispensable. Here, a quantum-statistical theory is used to calculate spectral line shapes of H and H-like Li. Ionic perturbers are treated quasi-statically as well as dynamically via frequency fluctuation model and model microfield method, see [1]. Electronic perturbers are treated in impact approximation. Strong electron emitter collisions are consistently taken into account with an effective two-particle T-matrix approach, see [2]. Convergent close coupling calculations give scattering amplitudes including Debye screening for neutral emitters. For charged emitters, the effect of plasma screening is estimated. Considered electron densities reach up to n_e = 10²⁷ m⁻³. Temperatures are between T = (10⁴ − 10⁵ ) K. Results for Lyman lines are compared with a dynamically screened Born approximation.

[1] Sonja Lorenzen, Comparative study on ion-dynamics for broadening of Lyman lines in dense hydrogen plasmas, Contributions to Plasma Physics, 53, 368-374 (2013)

[2] Sonja Lorenzen, August Wierling, Heidi Reinholz, Gerd Röpke, Mark C. Zammit, Dmitry V. Fursa, and Igor Bray, Quantum-statistical line shape calculation for Lyman-alpha lines in dense H plasmas, J. Phys.:Conf. Ser., 397, 012021 (2012)