Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 18: Interaction with strong or short laser pulses I
A 18.4: Vortrag
Mittwoch, 16. März 2011, 17:15–17:30, BAR 106
Induced inverse bremsstrahlung for cluster nanoplasmas in intense laser fields — •Max Moll1, Paul Hilse1, Thomas Bornath2, Manfred Schlanges1, and Vladimir P. Krainov3 — 1Institut für Physik, Universität Greifswald, Germany — 2Institut für Physik, Universität Rostock, Germany — 3Moscow Institute for Physics and Technology, Russia
During the interaction of noble gas clusters with intense laser fields, nanoplasmas with high density and high temperature are created. The heating of the clusters is significantly determined by inverse bremsstrahlung of the electrons due to electron-ion collisions. In this contribution we investigate the dependence of the heating rate on relevant parameters such as the mean ion charge, the laser field strength or the velocity of the electrons. Heating rates are calculated in first Born approximation as well as using a classical approach by solving Newton's equation. We study the influence of the inner ionic structure of the noble gas ions (Ar, Kr, Xe) on the heating rates which can be achieved by the use of appropriate model potentials. Also considered are screening effects due to the surrounding plasma medium.
The dependence of the results on the kinetic energy of the electrons is discussed. The comparison with Coulomb-particles in the different approximations shows that it is important to account for the inner ionic structure.