Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 15: Poster: Interaction with strong or short laser pulses
A 15.10: Poster
Montag, 17. März 2014, 16:30–18:30, Spree-Palais
Reconstructing the shape of single nanoclusters imaged with highly intense X-ray pulses — •A. Ulmer1, L. Flückinger1, T. Gorkhover1, B. Langbehn1, J.P. Müller1, M. Müller1, D. Rupp1, M. Sauppe1, A. Schreider1, C. Bostedt2, I. Barke3, H. Hartmann3, K.H. Meiwes-Broer3, S. Toleikis4, S. Düsterer4, R. Treusch4, and T. Möller1 — 1TU Berlin — 2LCLS@SLAC — 3Uni Rostock — 4DESY Hamburg
Free-Electron Lasers (FELs) provide coherent highly intense and short pulses which make it possible for the first time to analyze the morphology of non-periodic or non-crystallizable nanoparticles by elastic light scattering. In addition to shape and structural information the optical properties (dielectric function) and their changes during the light pulse can be imaged.
We recently performed single shot experiments on single large clusters at the Free-Electron LASer Hamburg (FLASH) in a NIR/XUV pump-probe configuration. Reconstruction of the scattering patterns will give insight in both the growth process of the particles as well as the ionization dynamics in the irradiated clusters.
As the phase information is lost due to the imaging process it has to be retrieved using sophisticated techniques [1]. The information in the scattering patterns is limited by experimental constraints such as a necessary center hole and the limited detector size. Possible approaches combining scattering simulations and phase retrieval algorithms will be discussed.
[1] S. Marchesini et. al., Phys. Rev. B 68, 140101 (2003)