Free-electron lasers (FELs) are a type of laser that generates high-intensity, coherent light by using a beam of free electrons accelerated through a magnetic structure. This technology allows for the production of tunable wavelengths across the electromagnetic spectrum, making them particularly valuable in various fields, including protein crystallography and structure determination. By providing intense X-ray beams, FELs enable researchers to analyze the atomic structure of proteins and other biological macromolecules with high resolution.
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