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A: Atomphysik

A 16: Atomic Clusters and Cold Atoms II

A 16.4: Fachvortrag

Wednesday, March 9, 2005, 11:00–11:15, HU 3075

Correlation in the Ion and Electron Emission from Silver Nanoparticles after Exposure to Strong Laser Fields — •Paul Radcliffe, Tilo Döppner, Christian Schaal, Josef Tiggesbäumker, and Karl-Heinz Meiwes-Broer — Institut für Physik, Universität Rostock, Universitätsplatz 3. 18051 Rostock

In the interaction between intense laser light and metallic systems, collective excitations play an important role. So far nothing is known about the kinetic energy of the emitted electrons when samll particles are exposed to laser intensities in the region from 10¹³ – 10¹⁴W/cm². In a dual pulse experiment we have investigated the correlation between the ion and electron emission dynamics.

For the first time detailed time and energy–resolved electron spectra were measured. A striking time dependence of the ionization efficiency and electron emission is seen for Ag nanoparticles. We obtain electron energies of up to 350 eV and charge states up to z = 13 which are much higher compared to the single atom interaction. The dynamics of the fast electrons was found to have an almost one–to–one correspondence with the generation of highly charged ions.