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This thesis deals with experiments on resonant multi-photon double
ionization of Neon monomers and dimers. Experiments were carried
out at the reaction microscope beamline of the XUV free-electron
laser FLASH2. Employing the variable gap undulators of FLASH2,
the photon energy was scanned over the 2s-2p resonance in ionic
Ne+ at 26:9 eV, where resonance-enhanced sequential ionization and
single-photon laser-enabled Auger decay (spLEAD) is expected for
monomers and Interatomic Coulombic Decay (ICD) for dimers. As
FLASH2 operates in SASE mode, which leads to large statistical fluctuations,
post-analysis of single-shot diagnostics was developed and
performed. The pulse energy was monitored through a photocurrent
on the final focusing mirror and the photon energy with an electron
spectrometer. Through single-shot analysis of the pulse-energy better
insight into the power scaling of the ionization rates could be gained.
