| Function and dynamics in complex matter is often governed by disperse active sites, long range interactions and a large number of coupled degrees of freedom. Using the high brillance femtosecond X-ray pulses from FLASH femtosecond time resolved X-ray spectroscopic methods are developed to excite and follow wave packet dynamics in complex matter on the atomic scale. In a first step X-ray induced transient optical reflectivity has been established as a tool for femtosecond X-ray/optical cross-correlation. In a next step the influence of X-ray induced dynamics at high X-ray fluence has been studied and first femtosecond time resolved experiments will be presented. |
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