Datensatz

Zusammenfassung

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.