Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 19: Atomic clusters I
A 19.7: Vortrag
Donnerstag, 17. März 2011, 12:15–12:30, BAR 205
Resonant charging of Xe clusters in Helium nanodroplets under intense laser fields — •Christian Peltz and Thomas Fennel — Institute of Physics, University of Rostock, Germany
When exposed to intense laser fields, mixed clusters in core-shell configuration are expected to show multiple plasmon resonances[1]. There is an ongoing debate on the resulting signatures in the final emission spectra of ions and electrons. To study the microscopic interaction dynamics, we theoretically investigate Xe clusters embedded in He nanodroplets under pump-probe laser excitation (τ=25 fs, I0=2.5×1014W/cm2, λ=800 nm). Our molecular dynamics simulations on Xe309He10000 and comparison to simulation results for free Xe309 give evidence for the presence of selective resonance heating in the He shell and the Xe cluster, while a corresponding double hump feature in the final Xe charge spectra is absent. The pump-probe dynamics of the Xe spectra from the embedded system is qualitatively similar to that of the free species. In strong contrast to that, the predicted electron spectra do show well-separated and pronounced features from highly efficient plasmon assisted electron acceleration for both resonances in the embedded clusters. A detailed analysis of the ionization and recombination dynamics explains the apparent disaccord between the resonance features in ion and electron spectra[2].
[1] A. Mikaberidze et al. , Phys. Rev. A 77, 041201 (2008)
[2] Ch. Peltz and Th. Fennel, arXiv:1009.4546v1