Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 14: Interaction with VUV and X-ray light II
A 14.3: Vortrag
Dienstag, 13. März 2012, 11:00–11:15, V57.05
XUV-fluorescence of a FEL pulse created nano plasma in rare gas clusters — •M. Müller1, L. Schroedter2, M. Adolph1, D. Rupp1, T. Oelze1, L. Nösel1, L. Flückiger1, T. Gorkhover1, M. Krikunova1, A. Przystawik2, A. Kickermann2, T. Laarmann2, and T. Möller1 — 1TU-Berlin IOAP, Hardenbergstr 36, 10623 Berlin — 2HASYLAB at DESY, Notkestr. 85, 22607 Hamburg
FLASH, the first free electron laser operating at short wavelength (4nm-47nm) and intense pulses (1016W/cm2), has opened up many new fields of research in the last decade [1]. Nonlinear laser-matter processes, in particular the nonlinear response of nanosized systems to FEL pulses became a field of considerable interest.
We investigate the formation of the FEL induced nanoplasma within rare gas clusters. Fluorescence spectroscopy is used as a promising approach to study the heating and relaxation dynamics, before the radiation damage leads to total destruction of the clusters. Thus we can complement the disciption obtained by ion spectroscopy and light scattering [2]. Xenon clusters excited with 90eV photons exhibit a variety of fluorescence lines between 10 and 100 eV, which show a clear dependence on the excitation power density and cluster size. For the highest power densities fluorescence lines occure even above the excitation energy.
1 Bostedt, C. et al. (2009) Nucl. Instrum. Methods Phys. Res. A 601 108-22
2 Bostedt, C. et al. (2010) J. Phys. B: At. Mol. Opt. Phys. 43 194011