Frankfurt 2006 – wissenschaftliches Programm

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A: Atomphysik

A 20: Poster II: Atomare Systeme in starken Laserpulsen und statischen Feldern

A 20.13: Poster

Donnerstag, 16. März 2006, 16:30–18:30, Labsaal

Imaging of Atomic Clusters with Intense Femtosecond XFEL Pulses — •Christian Gnodtke, Ulf Saalmann, and Jan-Michael Rost — Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzerstrasse 38, D-01187 Dresden, Germany

We investigate the possibility of imaging atomic clusters with intense femtosecond laser pulses as will be available from X-ray free electron laser (XFEL) sources in the future. The X-ray diffraction pattern is simulated and a phase-retrieval algorithm using the oversampling method [1] is employed to reconstruct the cluster geometry. Since the image quality is limited by appreciable radiation damage to the cluster (ionization and subsequent expansion) even for femtosecond pulses, we consider the laser-induced dynamics. Using quantum-mechanical transition rates combined with a molecular dynamics simulation of free electrons and ions [2], we investigate the constraints on the experimental parameters for imaging purposes.

[1] J. Miao, D. Sayre and H. N. Chapman. J. Opt. Soc. Am. A 15, 1662 (1998)

[2] U. Saalmann and J.-M. Rost. Phys. Rev. Lett. 89, 143401 (2002)