Hannover 2013 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 9: Atomic clusters I (with A)

MO 9.4: Vortrag

Montag, 18. März 2013, 17:30–17:45, B 302

Clusters in intense femtosecond XUV pulses: Direct simulation of light scattering — •Christian Peltz¹, Charles Varin², Thomas Brabec², and Thomas Fennel¹ — ¹Institute of Physics, University of Rostock, Germany — ²Department of Physics and Centre for Photonics Research,University of Ottawa, Canada

Recent XUV experiments on rare gas clusters at FLASH have proven that single-shot imaging of clusters contains valuable information on transient matter properties under intense XUV excitation [1]. These advances show that IR-XUV pump-probe experiments are in reach to illuminate the ultrafast dynamical evolution of highly excited nanosystems via the XUV scattering. However, so far no well established theory exists to fully describe the light scattering of strongly dynamical systems including nonlinear and transient effects. We propose a route to such theoretical analysis based on the recently introduced microscopic particle-in-cell (MicPIC) approach [2]. MicPIC enables us to simultaneously account for the nonlinear laser-cluster interaction dynamics including ionization, heating, and expansion along with light propagation on the fully microscopic level and without any restrictions on particle geometry. We report first theory results on XUV only and IR-XUV pump probe scenarios for large rare gas clusters up to (D∼80nm), which show the typical geometry-induced Mie scattering as well as elastic and inelastic XUV light scattering signals stemming from nonlinear effects and plasmonic excitations of the nanoplasma.

[1] C. Bostedt et al., Phys. Rev. Lett. 108, 093401 (2012)

[2] C. Varin et al., Phys. Rev. Lett. 108, 175007 (2012)