Browsing Fakultät für Physik (inkl. GAUSS) by Referee "Salditt, Tim Prof. Dr."
Now showing items 21-40 of 65
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X-ray waveguide optics: Beyond straight channels
(2017-04-28)Modern x-ray sources and analysis techniques such as lens less imaging combined with phase retrieval algorithms allow for resolving structure sizes in the nanometerrange. For this purpose optics have to be employed, ... -
Tomographic STED Microscopy
(2017-03-09)Due to its non-invasive access to sub-cellular structures, far-field fluorescence microscopy constitutes one of the most prevalent methods in the life sciences. For more than one century, it had been common knowledge ... -
Measurement of the stopping power of water for carbon ions in the energy range of 1 MeV - 6 MeV using the inverted Doppler–shift attenuation method
(2016-12-08)Cancer therapy using carbon ions has gained increasing interest in the last decade due to its advantageous dose distributions. For the dosimetry and treatment planning, the accurate knowledge of the stopping power of water ... -
Computer simulation and analysis of self-assembled alkylthiol monolayers on the surface of liquid mercury
(2016-08-10)In this dissertation I investigate the structure and thermodynamics of alkylthiol (thiol) surfactants on the surface of liquid mercury (Hg) by means of the large-scale Molecular Dynamics (MD) techniques. Simulations ... -
Phase retrieval for object and probe in the optical near-field
(2016-01-12)Lensless, holographic X-ray microscopy is a non-invasive imaging technique that provides resolution on the nanometer scale. Therefore, a divergent, coherent and especially clean wavefront impinging on the sample is needed. ... -
Cone-beam x-ray phase-contrast tomography for the observation of single cells in whole organs
(2015-11-10)X-ray imaging enables the nondestructive investigation of interior structures in otherwise opaque samples. In particular the use of computed tomography (CT) allows for arbitrary virtual slices through the object and 3D ... -
Scanning X-Ray Nanodiffraction on Dictyostelium discoideum
(2015-11-06)In the recent years, novel focussing optics for synchrotron radiation sources became available, which now allow focussing the x-radiation down to 100\,nm (FWHM). Thus, the typically poor spatial resolution of Small Angle ... -
Developments in Femtosecond Nanoelectronics
(2015-01-21)Coupling light to metal surfaces can break the diffraction limit and concentrate optical fields at the nanoscale. The studies presented in this cumulative thesis investigate the influence of optical field localization ... -
Coherent X-Ray Diffractive Imaging on the Single-Cell-Level of Microbial Samples:
(2014-12-17)Since its first experimental demonstration in 1999, Coherent X-Ray Diffractive Imaging has become one of the most promising high resolution X-Ray imaging techniques using coherent radiation produced by brilliant synchrotron ... -
Development of an ultrafast low-energy electron diffraction setup
(2014-12-11)Quasi two-dimensional systems such as surfaces and atomically thin films can exhibit drastically different properties relative to the material's bulk, including complex phases and transitions only observable in reduced ... -
Sulfur Speciation in Urban Soils Studied by X-Ray Spectroscopy and Microscopy
(2014-04-03)The presented thesis is of pronounced interdisciplinary character; based on applied physics, it addresses a challenging analytical task in soil science. The goal of this work is to specify and analyze the sulfur pool ... -
Extreme-ultraviolet light generation in plasmonic nanostructures
(2014-01-30)The present (cumulative) thesis examines fundamentals of nanostructure-enhanced extreme-ultraviolet light generation in noble gases using two different nanostructure geometries for local field-enhancement. Specifically, ... -
Scanning X-Ray Nano-Diffraction on Eukaryotic Cells: From Freeze-Dried to Living Cells
(2013-12-13)The cytoskeleton of eukaryotic cells is a complex and dynamic network of different biopolymers, which plays an important role in, e.g., the determination of cellular shape, mechanical properties, and consequently specific ... -
Differentielle interferometrische Partikelverfolgung mit Subnanometer- und Submillisekundenauflösung
(2013-09-06)Single-particle tracking experiments have provided the opportunity to monitor dynamical processes on length scales from millimeter to subnanometer. Especially in biology, where relevant processes on the molecular level ... -
Ein Verfahren zur Herstellung zweidimensionaler Röntgenwellenleiter
(2013-07-15)As X-ray beams only weakly interact with matter, conventional refracting optics are not suitable for the use in this energy range. Instead, different approaches replace conventional optics in the X-ray regime, one of them ... -
Primary Effects of X-ray and Photo-Absorption Induced Excitations in Biomolecules
(2013-06-27)To see whether single molecule scattering experiments can yield atomic resolution structures of biomolecules, it is necessary to understand the physics underlying the radiation damage processes induced by the X-ray ... -
A Dedicated Endstation for Waveguide-based X-Ray Imaging
(2012-08-30)X-ray microscopy has emerged as a powerful and versatile imaging technique in many fields of science over the last years, offering insights in opaque media at high spatial resolution. A major challenge remains the ... -
Herstellung von Optiken für weiche Röntgenstrahlung und deren Charakterisierung an Labor- und Synchrotronstrahlungsquellen
(2012-03-29)Within the last decades soft X-ray microscopy methods win increasing importance. Labratory-scale laser-induced plasma sources make this radiation available to a larger community of researchers ... -
Wave optical simulations for x-ray nano-focusing optics
(2012-02-22)Curved x-ray multilayer mirrors focus synchrotron beams down to tens of nano metres. A wave-optical theory describing propagation of two waves in an elliptically curved focusing multilayer ... -
Synaptic Vesicles Studied by Small-Angle X-Ray Scattering
(2010-12-21)The heterogeneous structure of synaptic vesicles isolated from rat brain is investigated considering solution small-angle x-ray scattering data in combination with data obtained by cryogenic ...