Berlin 2014 – scientific programme

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A: Fachverband Atomphysik

A 23: Poster: Atomic clusters (with MO)

A 23.3: Poster

Tuesday, March 18, 2014, 16:30–18:30, Spree-Palais

Strong scattering in laser-driven rare-gas clusters — •Merten Siegfried, Christian Peltz, and Thomas Fennel — Institute of Physics, University of Rostock

Rare-gas clusters under intense laser pulses are rapidly transformed into finite nanoplasmas. Though main features of the underlying microscopic plasma dynamics can be well described by molecular dynamics (MD) simulations including rate equations for atomic ionization [1], the microscopic treatment of collisions remains a challenge. Electron-atom collisions are often neglected completely though they can be essential to account for the important electron emission processes, such as electron surface backscattering observed at dielectric nanospheres [2]. Also elastic electron-ion scattering is vastly underestimated in MD models using effective soft-core Coulomb potentials as the short-range interaction, primarily responsible for strong collisions, is regularized. We propose a microscopic scheme to re-introduce the missing scattering from the short-range electron-atom/ion interaction as local collisions. A detailed analysis of the impact of elastic electron-atom/ion scattering on the excitation dynamics of medium-sized Argon clusters in intense near-infrared laser fields will be presented.

[1] T. Fennel et al., Rev. Mod. Phys. 82, 1793 (2010)

[2] S. Zherebtsov et al., Nature Phys. 7, 656 (2011)