Hannover 2016 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 29: Atomic clusters (with MO)

A 29.1: Poster

Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof

Cooling Dynamics of Superheated Nanoplasmas — •Theresia Ziegs, Christian Peltz, and Thomas Fennel — Universität Rostock, Insitut für Physik, Germany

When atomic clusters are irradiated with short and intense laser pulses they are turned into highly excited nanoplasmas on the sub-picosecond time scale, eventually resulting in the emission of fast electrons, highly charged and energetic ions and high energy radiation [1, 2]. Theoretical studies concentrated on the early phase of the laser driven cluster dynamics (<1ps), shining light on the fundamental laser-cluster interaction processes and thereby allowing to understand and interpret a multitude of experimental observations. In the subsequent cluster relaxation the dynamics is mainly dictated by expansion cooling of the electrons and electron-ion recombination, which significantly influences the final energy and charge spectra [3, 4, 5]. In this work we analyze the so far barely studied long-term relaxation of laser-driven rare gas clusters with molecular dynamics simulation. Irrespective of the particular expansion conditions we observe an abrupt change of the electron cooling rate after roughly 1 ps that can be attributed to a transition from weak to strong coupling [6].

[1] U. Saalmann et al., J. Phys. B 39, R39 (2006)

[2] T. Fennel et al., Rev. Mod. Phys. 82, 1793 (2010)

[3] M. Arbeiter et al., Phys. Rev. A 89, 043428 (2014)

[4] B. Schütte et al., Phys. Rev. Lett. 112, 253401 (2014)

[5] T. Gorkhover et al., Phys. Rev. Lett. 108, 245005 (2012)

[6] Yu. V. Dumin, Plasma Phys. Rep. 37, 858 (2011)