International Union of Crystallography, Journal of Synchrotron Radiation, 6(27), p. 1720-1724, 2020
DOI: 10.1107/s1600577520011716
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A simple scheme is proposed and experimentally confirmed to generate X-ray free-electron lasers (XFELs) consisting of broadband and narrowband beams with a controllable intensity ratio and a large photon-energy separation. This unique two-color XFEL beam will open new opportunities for investigation of nonlinear interactions between intense X-rays and matter.