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Free electron lasers (FEL) are highly intense, femtosecond x-ray sources. With these sources it is currently possible to image nanostructures and in the future also single (bio) molecules. Understanding the ionization and subsequent Coulomb explosion of the samples in the intense x-ray laser pulse is crucial for the success of the imaging experiments. It is, however, only scarcely investigated. We are developing an experimental approach for two-color scattering experiments with the inherently correlated harmonics of the FEL. The wavelength separation and pulse delay are realized with multilayer optics. As detector a pn-CCD based system is used. We present first results of sinlge-shot single-wavelength experiments at 13.5 nm FEL wavelength and first attempts of two-color scattering experiments. The investigations show that after optimizing the experimental conditions two-color single-shot studies utilizing the first and third harmonic of the FEL are feasible. |
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