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This article is about the accelerator-based X-ray laser. For the superhero, see Flash (comics). For other uses, see Flash (disambiguation).

FLASH, acronym of Free Electron LASer in Hamburg, a particle accelerator-based soft X-ray laser located at the DESY accelerator facilities in Hamburg, Germany. It can generate very powerful, ultrashort pulses (~10−14 s) of coherent radiation in the energy range 10 eV (electronvolt) to 200 eV. It started operation for external users in the year 2005 and is used for surface, molecular and atomic physics experiments. Intended applications are also the imaging of single biological complex molecules with time resolution.


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