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PETRA III, which took up operation in 2009, is the most brilliant storage-ring-based X-ray radiation source at Germany´s research centre DESY. As the most powerful light source of its kind, it offers scientists outstanding experimental opportunities with X-rays of an exceptionally high brilliance. In particular, this benefits researchers investigating very small samples or those requiring tightly collimated and very short-wavelength X-rays for their experiments. Together with DESY´s free-electron laser FLASH, PETRA III attracts scientists from all over the world to perform experiments in the fields of physics, biology, chemistry and crystallography, materials and geological sciences as well as medical applications.