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Thesis

XUV Free-Electron Laser Experiments on Weakly Bound Dimers: Construction of a Water-Dimer Jet Source and Resonance-Enhanced ICD in Ne2

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Meister,  Severin Morris
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Citation

Meister, S. M. (2016). XUV Free-Electron Laser Experiments on Weakly Bound Dimers: Construction of a Water-Dimer Jet Source and Resonance-Enhanced ICD in Ne2. Master Thesis, Ruprecht-Karls-Universität, Heidelberg.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002D-10B6-A
Abstract
The thesis at hand is dealing with two different experiments on dimers, water (H2O) 2 and Neon dimers Ne2 specifically. The first part focuses on the design and construction of an in-vacuum water cluster source, which operates on the principle of supersonic gas expansion. A subsequent commissioning was done to characterize and optimize the performance of the source with respect to the demanded parameters, especially the water dimer yield. Upcoming experiments on proton transfer dynamics in water dimers will employ the developed cluster source. In the second part, an experiment on the resonance-enhanced Interatomic Coulombic Decay (ICD) is presented. It was carried out at the Free-Electron Laser in Hamburg (FLASH), providing high intensities and photon energies in the extreme ultraviolet regime (XUV). By employing the wavelength tunability of FLASH2, we observed an enhancement of ICD, by scanning the Ne+ (2p) -1 -> Ne+ (2s) -1 resonance at 26:9 eV (46:1nm). The resulting Ne++Ne+ fragments were measured with a Reaction Microscope in coincidence.