Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 22: Poster: Interaction with strong or short laser pulses
A 22.12: Poster
Dienstag, 13. März 2012, 16:30–19:00, Poster.V
XUV pulse induced fluorescence of a nano plasma from argon clusters — •Lena Nösel1, Maria Müller1, Marcus Adolph1, Daniela Rupp1, Tais Gorkhover1, Maria Krikunova1, Tim Oelze1, Lasse Schrödter2, Andreas Prystawik2, Andreas Kickermann2, Tim Laarmann2, and Thomas Möller1 — 1TU Berlin, Institut für Optik und Atomare Physik, Deutschland — 2Hasylab/DESY, Notkestr.85, 22607 Hamburg
The high peak intensities of up to 1015*W/cm2 of the Free Electron Laser in Hamburg (FLASH) opened up a new field for the investigation of light-matter interaction especially with pulse durations of 10 fs to 100 fs in the soft x-ray regime at 90eV. Our experiment concentrates on argon clusters where a nano plasma is formed during the interaction with the soft x-ray pulses. Fluorescence spectroscopy is used to investigate recombination processes within this nano plasma. We follow the development of fluorescence spectral lines produced by the interaction of the argon clusters with the XUV- radiation. Results of our study show that with increasing intensity of ionizing radiation the photo lines corresponding to the higher charge states increase while the lines attributed to the lower ionic charge states drop down. Furthermore, at highest achieved intensity fluorescence lines with photon energy above the XUV excitation energy of 90eV could be detected. This is indicative for non-linear processes during excitation of the clusters.(cf. [1]) [1] U.Saalmann et al., J.Phys.B:At.Mol.Opt.Phys.39(2006)R39-R77.