Cut through the ion momentum spectrometer.
Spectral distribution of EUV-FEL pulses. (a) Five spectra for individual FEL shots and (b) average of over 50 laser shots.
2D recoil momentum distribution of . The dashed circles indicate the momentum positions for single-photon ionization of the second and third harmonics. The spectrum was recorded with the central potion of the FEL beam.
Spatial distributions of the intensity for the fundamental, the second, and the third harmonics in the experimental chamber.
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