Hannover 2010 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 2: Diagnostics

P 2.9: Vortrag

Montag, 8. März 2010, 16:30–16:45, B 305

Improved self-energy calculations for pressure broadening of spectral lines in dense plasmas — •Sonja Lorenzen1, August Wierling1, Heidi Reinholz1,2, and Gerd Röpke11Institut für Physik, Universität Rostock, Deutschland — 2Institut für Theoretische Physik, Johannes Kepler Universität Linz, Österreich

Pressure broadening of Lyman-lines of hydrogen-like lithium (Li2+) is studied using a quantum statistical approach to the line shape in dense plasmas [1]. The electronic self-energy, which is an important correlative effect, enters into the line profile calculations as a basic input. So far, we have neglected the effect of strong, i.e. close, electron-emitter collisions, but they play generally an important rôle in dense plasmas, as has already been shown by Griem in [2].

We present a method to calculate an improved electronic self-energy including strong collisions based on a two-body T-matrix and an effective optical potential including non-local exchange effects [3]. The method is tested for level broadening of the ground state and the 2p state of hydrogen and compared to other T-matrix results [4]. The implications for the Lyman lines of Li2+ are discussed, too.

[1] S. Lorenzen et al., Contrib. Plasma Phys. 48, 657 (2008)

[2] H. R. Griem, Spectral line broadening by plasmas (Academic Press, London, 1974)

[3] S. Lorenzen et al., to appear in Contrib. Plasma Phys., 50 (2010)

[4] S. Günter, Phys. Rev. E 48, 500 (1993)

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