Augsburg 2006 – scientific programme
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P: Plasmaphysik
P 28: Astrophysikalische Plasmen; Dichte Plasmen 1; Schwerionen- und lasererzeugte Plasmen 2; Staubige Plasmen 4; Theorie 1
P 28.3: Poster
Wednesday, March 29, 2006, 17:30–19:00, Flure
The Cl Kα line in dense plasma — •A. Sengebusch, G. Röpke, H. Reinholz, and S. Glenzer — Institute of Physics, University of Rostock, Universitätsplatz 3, D - 18051 Rostock, Germany
Recently, experiments have been performed where thin foils of saran
were irradiated by an intense laser beam [1].
The emitted X-ray spectrum was investigated to develop X-ray probes
for Compton scattering on warm dense plasma. The Kα line of
chlorine at 2623 eV
is of particular interest since it has suitable features. Using
theoretical considerations we will investigate the influence of
ionization, as well as
the formation of a hot, dense plasma on the shape of the spectral
line and a possible shift.
In contrast to the width of spectral lines (pressure broadening),
the shift of spectral lines in dense plasma has only been
investigated for some special contexts due to the requirement of
more advanced theoretical approaches.
Considering theories of scattering by electrons in the
unified (as well as impact) approximation within the so-called no-
quenching
approximation, no shift at all is obtained. More consistent
treatments have been
elaborated recently [2,3]. We will show that an estimation based on
a simplified
treatment of shift of electron bound states due to screening in a dense
plasma leads to a line shift at high plasma densities.
An approach for a more consistent quantum statistical treatment of
the profile of
spectral lines will be discussed.
[1]
M. K. Urry et al. , J.
Quant. Spectrosc. Radiat. Transfer, 2005, in press
[2] S. Sorge et al. , J. Phys. B: Mol. Opt. Phys. 33, (2000) 2983
[3] G. Röpke et al. , Contrib. Plasma Phys. 45 (2005) 414