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A: Fachverband Atomphysik

A 19: Atomic clusters I

A 19.1: Hauptvortrag

Donnerstag, 17. März 2011, 10:30–11:00, BAR 205

Cluster ionization in strong laser fields - NIR vs. XUV — •Thomas Fennel, Jörg Köhn, Christian Peltz, and Mathias Arbeiter — Universität Rostock, 18051 Rostock, Germany

Clusters in intense laser pulses are valuable model systems for exploring new frontiers of ultrafast strong-field many-particle physics [1]. The understanding of key processes like collective excitations, ultrafast plasma creation, field amplification, and electron rescattering in clusters may open up new routes for the analysis and control of nanosystems with light. The talk will focus on two aspects: (i) waveform control of resonance enhanced electron emission in near-infrared pulses (NIR); (ii) ionization and heating behavior at short wavelength (XUV).

The first part discusses a scheme for efficient electron acceleration via resonant plasmonic effects [2], i.e. due to high transient polarization fields from resonant interaction of the laser with free cluster electrons. Numerical results for the directional control of the electron emission from metal clusters by the carrier-envelope phase of few-cycle laser fields will be presented [3]. The second part focusses on the ionization and heating of rare-gas clusters at high photon energy [4], where plasma heating disappears and photoionization dominates the laser-matter coupling. A two-color pump-probe scheme for the time-resolved analysis of the cluster dynamics is proposed.

[1] Th. Fennel et al., Rev. Mod. Phys. 82:1793 (2010)

[2] Th. Fennel et al., Phys. Rev. Lett. 98:143401 (2007)

[3] J. Köhn et al., in preparation

[4] M. Arbeiter and Th. Fennel, Phys. Rev. A, 82:013201 (2010)