Hannover 2010 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 14: Atomic Clusters II

A 14.3: Vortrag

Mittwoch, 10. März 2010, 17:30–17:45, F 303

Collective Modes of Laser Excited Electrons in Clusters — •Thomas Raitza¹, Igor Morozov², Heidi Reinholz^3,1, and Gerd Röpke¹ — ¹Institut für Physik, Universität Rostock; Universitätsplatz 3, 18055 Rostock, Germany — ²Joint Institute for High Temperature of RAS; Izhorskaya, 13, build. 2, Moscow 125412, Russia — ³Institut für Theoretische Physik, Johannes-Kepler-Universität Linz; 4040 Linz, Austria

Clusters of solid state densities can form nano plasmas after laser irradiation with intensities of 10¹³ − 10¹⁶ Wcm⁻². Optical properties of plasmas are related to correlation functions, see [1]. A restricted MD simulations scheme for finite systems is introduced in [2], answering the question of local thermal equilibrium of electrons inside a cluster after laser irradiation. Plasma properties like temperature and density are discussed, see [3]. Investigations of dynamical correlations for finite systems via restricted MD simulations are presented. Collective electron excitation modes are analysed using spherical harmonics. The spatially resolved momentum auto-correlation spectrum is interpreted in terms of collective electron excitation modes. Resonance frequencies are calculated and damping rates are discussed. Size effects of dynamical properties are investigated.

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

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

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