Berlin 2005 – wissenschaftliches Programm

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A: Atomphysik

A 13: Poster HU 2

A 13.54: Poster

Dienstag, 8. März 2005, 08:30–18:30, Poster HU

Xenon Clusters in Soft X-Ray Laser Fields — •Ionut Georgescu, Ulf Saalmann, and Jan-Michael Rost — Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, 01187 Dresden

The new X-Ray free electron laser sources under construction at DESY in Hamburg and at the LCLS in Stanford will open new land in the exploration of properties of matter – such as electronic and magnetic structure, chemical composition etc. Moreover it will allow us to study dynamical processes with atomic resolution and on a femtosecond time scale.

First experiments on the ionization of atomic clusters in intense soft X-Rays from an free electron laser [1] have revealed an average absorption of up to 50 photons per atom. In contrast, single atoms exposed to the same laser pulses would undergo just one ionization by one-photon absorption.

This phenomenon can be explained [2] by strong absorption through inverse bremsstrahlung in a very dense, highly collisional nanoplasma formed through inner ionization of the atoms in the cluster. Based on this model, we present here a study of the absorption of radiation in clusters with sizes varying from 55 to several thousand atoms.

H. Wabnitz et. al. , Nature 420, 482 (2002)
C. Siedschlag and J. M. Rost, PRL 93, 043402 (2004)