Darmstadt 2008 – scientific programme
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A: Fachverband Atomphysik
A 10: Posters: Atomic clusters
A 10.1: Poster
Tuesday, March 11, 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 AgN(N=500..2000) generated with a magnetron
sputtering source are irradiated with intense dual fs laser pulses
(Ilaser=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).