Stuttgart 2012 – scientific programme

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A: Fachverband Atomphysik

A 31: Interaction with strong or short laser pulses IV

A 31.5: Talk

Thursday, March 15, 2012, 11:45–12:00, V57.05

Angular-Resolved Electron Spectroscopy on Metal Clusters Exposed to Intense Laser Fields — •Johannes Passig, Dzimitri Komar, Robert Irsig, Thomas Fennel, Josef Tiggesbäumker, and Karl-Heinz Meiwes-Broer — Cluster & Nanostrukturen, Institut für Physik, Universität Rostock, Universitätsplatz 3, 18051 Rostock, Germany, www.physik.uni-rostock.de/cluster

Collective electron motion induces strong polarization fields in metal clusters exposed to intense IR-pulses. By resonant excitation of the cluster plasmon mode via an optimized pump-probe sequence, strong energy capture from the laser field and subsequent emission of highly charged and energetic species. We present first full angular-resolved electron spectra from silver nanoparticles exceeding 1keV (100 Up) at moderate laser intensities of 10¹⁴ W/cm². The emission shows a pronounced alignment along the laser polarization axis. Comparison of the experimental data with molecular dynamical simulations gives evidence, that the efficient acceleration proceeds via surface plasmon assisted rescattering, a mechanism unique for small particles [Fennel et al., Phys. Rev. Lett. 98, 143401 (2007)].