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A: Fachverband Atomphysik

A 5: Atomic systems in external fields

A 5.7: Vortrag

Montag, 23. März 2015, 16:00–16:15, C/kHS

Charge-resolved ion energy spectra of cluster coulomb explosion — •Dzmitry Komar, Josef Tiggesbäumker, and Karl-Heinz Meiwes-Broer — Universität Rostock, Institut für Physik, Universitätsplatz 3, D-18051 Rostock

Small silver metal particles of about 2000 atoms are produced by a magnetron sputtering gas aggregation cluster source. Directly in front of the nozzle the clusters are exposed to intense 100 fs dual pulses of about 10^13-10^14 W/cm^2. For the analysis of the charge-resolved ion energy spectra a modified Thomson parabola spectrometer is used. The new design features an improved energy resolution and a higher transmission compared to other setups. Optical delay studies show the impact of nanoplasmonic oscillations on the ion charge states as well as the recoil energies. Under optimized conditions charge states of up to q=19 and recoil energies of 300 keV are observed at moderate laser intensities. The results on the ions agree well with our recent studies on the electron emission under comparable conditions [1]. In particular at the Mie resonance the highly charged ions are predominantly emitted along the laser polarization axis.

[1] J. Passig, R. Irsig, N. X. Truong, T. Fennel, J. Tiggesbäumker, and K. H. Meiwes-Broer, New J. Phys. 14, 085020 (2012).