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. 2016 Jan 13;7:10343. doi: 10.1038/ncomms10343

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Diffracted intensity from the 20-nm-thick permalloy grating sample at 46.3° incidence. Data are collected under different seeding conditions (schematics on the left) using a position-sensitive CCD detector (images on the right); the 1,025 × 202 pixel images correspond to 13.84 × 2.73 mm² and cover ∼1.48° in scattering angle. (a) The λ_{seed_1}=261.5 nm laser pulse is sent through the modulator, turning on the Ni-3p resonant FEL emission at λ_{FEL_1}=18.7 nm in Rad_1 (14th harmonic) and no emission from Rad_2. (b) The λ_{seed_2}=255 nm laser pulse generates the Fe-3p resonant FEL emission at λ_{FEL_2}=23.2 nm in the radiator section Rad_2 (11th harmonic) and no emission from Rad_1. (c) Both seed laser pulses, delayed by Δt, interact with the electron bunch, generating Fe-3p resonant pump and Ni-3p resonant probe FEL pulses, also delayed by Δt.