Darmstadt 2008 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 10: Posters: Atomic clusters

A 10.1: Poster

Dienstag, 11. März 2008, 16:30–18:30, Poster C3

Laser-Driven Electron Acceleration in Metal Nanoparticles — •Christian Schaal¹, Johannes Passig¹, Thomas Fennel¹, Tilo Döppner², Josef Tiggesbäumker¹ und Karl-Heinz Meiwes-Broer¹ — ¹Institute of Physics, University of Rostock, Universitätsplatz 3, 18051 Rostock, Germany. — ²Lawrence Livermore National Lab, USA.

Silver clusters Ag_N(N=500..2000) generated with a magnetron sputtering source are irradiated with intense dual fs laser pulses (I_laser=10¹³...10¹⁴ W/cm²). In previous experiments we have demonstrated that the charging of the clusters can be enhanced by the resonant excitation of the dipolar mode leading to the emission of delocalized electrons. A comparison of energy and angular resolved measurements of the electron emission with microscopic analysis of corresponding semiclassical simulations indicates strong temporal beating in the electron emission at resonance and identifies phase-matched electron-cluster recollisions leading to multi-plasmon deexcitation, to produce the observed directional emission of most energetic electrons along the laser polarization axis, induced by resonant plasmon excitation at optimum pulse delay [1].

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