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Photoelectron spectrum in the region of He for overlapping beams showing the high and low-energy sidebands (SB). (dashed line) Theoretical photoelectron spectrum of He obtained from TDSE calculations (Ref. 12) for the present characteristics of the FEL and optical laser.
Single-shot spectra in the region of the Xe main line and the high-energy sidebands taken at the nominal temporal overlap and due to jitter also at . The spectra are normalized to total intensity. (right) Schematic of temporal overlap between FEL and IR pulses.
Cross correlation between the pulses of the FEL (, ) and of the IR (, ) laser. Each data point represents the signal obtained when integrating over all sidebands using an average over 250 shots.
Histogram of the relative probability distribution of the single-shot sideband signals. The simulation (gray) uses the experimentally determined jitter .
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