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FEMTOSPEX – a variable optical pump – X-ray probe facility

For many applications it is mandatory to prepare a well-defined quantum state and take motion pictures of its ultrafast dynamics with short X-ray pulses. Only recently, we have upgraded the existing slicing setup in that direction within the framework of the BMBF-project FEMTOSPEX, a joint project with the University of Duisburg/Essen. The main goal was here to link the existing setup to tunable wavelength pump lasers for resonant and non-resonant excitation. This improvement together with an upgrade to 6 kHz repetition rate was performed and commissioned in 2010 and successfully used in 2011.