Darmstadt 2008 – scientific programme

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P: Fachverband Plasmaphysik

P 16: Schwerionen- und lasererzeugte Plasmen I

P 16.3: Talk

Thursday, March 13, 2008, 17:00–17:15, 3D

K-line profiles in laser produced dense plasmas — •Andrea Sengebusch, Heidi Reinholz, and Gerd Röpke — Universität Rostock, Institut für Physik, 18051 Rostock, Germany

The features of X-ray spectral lines have been investigated by irradiation of solid targets with intense ultra-short pulse laser beams. The emitted K-line spectra can be used to determine plasma parameters and fields in regions beneath the laser created hot plasma layer.

A theoretical treatment of spectral line profiles on the level of a static plasma potential is applied on mid-Z materials. Hartree-Fock-calculations of ionic configurations verify a blue shift due to excitation and ionization. Calculations based on a self-consistent ion sphere model show a density, temperature and charge dependent red shift due to plasma polarization. These shifts range up to some eV and appear as an additional line broadening if spectral resolution is of the same order or worse. Moreover, line broadening due to the created electric and magnetic fields within the plasma has to be considered. A more fundamental approach based on the dielectric function in a Green function formalism can describe line shift as well as line broadening. First results due to this approach are shown.