Dresden 2011 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

A: Fachverband Atomphysik

A 19: Atomic clusters I

A 19.3: Vortrag

Donnerstag, 17. März 2011, 11:15–11:30, BAR 205

Dynamical structure factor of extended nano plasmas — •Thomas Raitza, Heidi Reinholz, and Gerd Röpke — Universität Rostock

The dynamical structure factor of bulk plasmas is related to correlation functions, see [1]. Clusters of solid state densities can form nano plasmas after laser irradiation with intensities of 10¹³ − 10¹⁶ W·cm⁻², which were investigated via molecular dynamics (MD) simulations. Free cluster electrons relax within a few femto seconds into a local thermodynamic equilibrium (LTE) in [2]. A restricted MD simulations scheme for finite systems has been developed in [3]. The generalization of the dynamical structure factor via bi-local current-density correlation function is introduced. Investigations of dynamical correlations via restricted MD simulations are presented for 1D chains [4] and 3D clusters. Several excitation modes were found and characterized. Dispersion relations for resonance frequencies were investigated with focus on cluster size dependency. In particular, the role of collisions on resonance damping will be presented.

[1] H. Reinholz; Ann. Phys. Fr. 30, N^o 4 - 5 (2006).

[2] T. Raitza, H. Reinholz, G. Röpke, I. Morozov, and E. Suraud; Contrib. Plasma Phys. 49, 498 (2009).

[3] T. Raitza, H. Reinholz, G. Röpke, and I. Morozov; J. Phys. A 42, 214048 (2009).

[4] T. Raitza, H. Reinholz, and G. Röpke; Int. J. Mod. Phys. B, accepted (2010).