Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 9: Interaction with strong or short laser pulses I
A 9.2: Vortrag
Montag, 18. März 2013, 17:00–17:15, B 305
Imaging the nanoplasma of single large xenon clusters with the Free-Electron Laser FLASH — •D Rupp1, M Adolph1, L Flückiger1, T Gorkhover1, M Krikunova1, M Sauppe1, D Wolter1, S Toleikis2, R Treusch2, S Schorb3, C Bostedt3, and T Möller1 — 1TU Berlin — 2Hasylab@DESY — 3LCLS@SLAC
Intense short pulses from Free-Electron Lasers in the short wavelength regieme as FLASH provide access to new fields of experiments such as imaging of single nanosized structures. We use rare gas clusters as ideal targets to study the interaction between matter and strong light pulses in a combined approach of measuring both ion spectra and scattered light. From the scattering patterns of single clusters, the particle size can be extracted, but also light induced changes in the clusters on a fs timescale are encoded in the scattered light [1]. Intensity profiles of the scattering patterns analyzed with Mie`s theory yield optical properties of the clusters. Strong modulations found in intense patterns of large clusters point to the formation of a core-shell system of the nanoplasma with a highly absorbing core and a weakly absorbing, tens of nanometers thick shell. In contrast, the ion spectra of the same clusters indicate the explosion of highly charged ions from only a very thin outer shell driven by coulombic repulsion and effective recombination of the remaining, quasi-neutral nanoplasma. Those results emphasize the capability of simultaneous imaging and ion spectroscopy of single clusters, to address different timescales of a complex process and thus gain a more complete picture.
[1] C. Bostedt et al, PRL 108, 093401 (2012)