Hamburg 2009 – scientific programme

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A: Fachverband Atomphysik

A 9: Interaction with Strong or Short Laser Pulses I

A 9.4: Talk

Tuesday, March 3, 2009, 11:45–12:00, VMP 6 HS-C

Time resolved two-color scattering experiments on clusters at the FLASH-FEL — •M. Adolph¹, D. Rupp¹, D. Wolter¹, S. Schorb¹, H. Thomas¹, R. Unterumsberger¹, R. Hartmann², N. Kimmel², L. Strüder², D. Rolles³, A. Rudenko³, K.U. Kühnel⁴, J. Ullrich⁴, T. Feigel⁵, H. Wabnitz⁶, T. Laarmann⁶, R. Treusch⁶, T. Möller¹, and C. Bostedt¹ — ¹TU - Berlin, IOAP — ²MPI Halbleiterlabor — ³ASG/MPG — ⁴MPI Kernphysik — ⁵Frauenhofer IOF — ⁶DESY

The rapid development of ultra bright soft X-Ray sources (FEL) makes the imaging of nano samples and bio molecules might become feasible. The evolution and interaction of nano scale samples in the X-Ray laser pulses is only scarcely investigated, even though it is critical for the success of the prospective imaging experiments. We are developing an experimental approach for two-color scattering experiments based on the inherently correlated harmonics of the FEL for studying the X-Ray inducted dynamics in clusters. The wavelength separation and pulse delay are realized with multilayer optics. The detector unit is based on three pn-CCD cameras. With this setup first single shot, single wavelength scattering experiments have already been accomplished. The obtained scattering data has been compared with simulations based on Mie's theory. Free parameters for this calculation are the size parameter, describing the ratio of the cluster size and the wavelength, and the complex refractive index. The refractive index is correlated to the electronic structure of the cluster. The experiments shed light on the electron dynamics during the femtosecond X-Ray pulses.