Ph.D. Theses

The crystallographic data processing is investigated with the goal of extracting more structural information from serial crysallographic experiments. Systematic errors resulting from uncontrollable aspects in the experimental setup were reduced in several places, but most significantly by modelling the expected intensity of partially observed intensities using Gaussian basis functions to improve merging. [...]

Elucidation of high-resolution three-dimensional protein structures via X-ray crystallography requires protein crystals for signal enhancement. Protein crystals have been observed in living cells from all domains of life. [...]

This thesis presents differential and total charm cross section measurements at various centerof-mass energies in pp collisions. For the purpose of measuring the total charm cross section,the D∗+ differential cross sections are measured at √s = 7, 0.9 and 13 TeV in the CMSdetector by covering the largest possible phase space, resulting in the smallest extrapolationfactor ever introduced at the LHC. [...]

The Standard Model of particle physics can be seen as the low energy limit of a more general Standard Model effective field theory (SMEFT), which captures the dynamics of possible ultraviolet completions in terms of higher-dimensional operators. The associated parameter space is large and involves intricate mixing patterns under the renormalization group (RG) flow. [...]

The MSSM is one of the most promising extensions of the SM. In the MSSM, the masses of the Higgs bosons can be predicted in terms of the other model parameters.In this thesis, we calculate for the first time the full electroweak two-loop contributions of $\mathcal{O}((\alpha_\text{em} + \alpha_\text{q})^2 N_c^2)$ to the MSSM Higgs boson masses using a Feynman-diagrammatic approach including the full dependence on the external momentum.These corrections are expected to constitute the dominant part of the two-loop corrections that were still missing up to now. [...]

Im Rahmen der vorliegenden Arbeit wurden verschiedene Seltenerd-dotierte LuPO4-Nanopartikel mit einer modifizierten Fällungsmethode synthetisiert. Alle Proben wurden zunächst mittels Aufnahme von Pulverröntgendiffraktogrammen charakterisiert. [...]

Neutrinos are unique messengers, as they travel unimpeded over cosmological distances, pointing back to their sources. As their production is tightly coupled to that of ultra-high energy cosmic rays, they could help us to understand the ultra-high energy universe. [...]

Gold nanoparticles have gained significant attention in nanoscience for their plasmonic properties. The localized surface plasmon resonance of gold nanoparticles is a strong interaction between electrons and light, which results in high absorbance in the visible spectrum, highly localized enhancement of the electric field at the particle surface, as well as the generation of highly excited electrons [...]

This thesis investigates the interaction of ultrashort, extreme-ultraviolet (XUV) and soft x-ray laser pulses with atoms and molecules in the gas phase. In total, the subject is explored from four different perspectives, which are all based on the short- lived–coherent electronic responses to the laser pulses, and measured with transient absorption spectroscopy [...]

This thesis uses Coulomb explosion imaging and covariance analysis to characterise concurrent fragmentation processes generating identical sets of products via different reaction pathways, highlighting the potential of extending these methods to study the photochemistry of larger, more chemically relevant species than those that have previously been studied. The photodissociation dynamics of CH2I2 at 202.5 nm were investigated using site-selective ionisation at the I 4d orbitals using photons of 95 eV. [...]