Ph.D. Theses

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2017-12-04
13:28
OpenAccess [PUBDB-2017-12739] Book/Report/Dissertation / PhD Thesis
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Micro-channel Cooling for Silicon Detectors
[DESY-THESIS-2017-046]
Hamburg : Verlag Deutsches Elektronen-Synchrotron, DESY-THESIS, 130 pp. (2018) [10.3204/PUBDB-2017-12739] = Dissertation, Universität Hamburg, 2017  GO
Silicon tracking detectors employed in high-energy physics are located very close to the interactionpoints of the colliding particle beams. The high energetic radiation emerging from the interactioninduces defects into the silicon, downgrading the efficiency to collect the charges created by passingparticles and increasing the noise while data taking. [...]
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2017-11-28
12:36
OpenAccess [PUBDB-2017-12442] Report/Dissertation / PhD Thesis
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Ultrafast X-ray Spectroscopies of Transition Metal Complexes Relevant for Catalysis
[XFEL.EU THESIS-2017-002]
207 pp. (2017) [10.3204/PUBDB-2017-12442] = Dissertation, University of Hamburg, 2017  GO
Transition metal (TM) complexes are ubiquitous in both technological and biological catalytic systems. For a detailed understanding of their reactivity, a knowledge of the fundamental processes during chemical reactions is crucial. [...]
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2017-11-21
18:55
OpenAccess [PUBDB-2017-12204] Dissertation / PhD Thesis
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Structural modification of solids by ultra-short X-ray laser pulses
252 pp. (2017) [10.3204/PUBDB-2017-12204] = Dissertation, University of Hamburg, 2017  GO
The motivation behind this Ph.D. project is to determine the structural modification of solids by ultra-short X-ray laser pulses. [...]
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2017-11-14
14:45
OpenAccess [PUBDB-2017-11984] Book/Dissertation / PhD Thesis
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Cone-beam x-ray phase-contrast tomography for the observation of single cells in whole organs
Göttingen : Göttingen University Press, Göttingen Series in X-ray Physics, 223 pp. (2015) [10.3204/PUBDB-2017-11984] = Dissertation, University of Goettingen, 2015  GO
ddc:530
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 information about intricate structures can be obtained. [...]
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2017-11-14
14:42
OpenAccess [PUBDB-2017-11983] Book/Dissertation / PhD Thesis
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Coherent X-ray diffractive imaging on the single-cell-level of microbial samples
Göttingen : Göttingen University Press, Göttingen Series in X-ray Physics, 238 pp. (2015) [10.3204/PUBDB-2017-11983] = Dissertation, University of Goettingen, 2014  GO
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 storage rings. The ability to directly invert diffraction data with the help of advanced algorithms has paved the way for microscopic investigations and wave-field analyses on the spatial scale of nanometres without the need for inefficient imaging lenses. [...]
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2017-11-14
14:05
[PUBDB-2017-11978] Book/Dissertation / PhD Thesis
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A dedicated endstation for waveguide-based x-ray imaging
Göttingen : Göttingen University Press, Göttingen Series in x-ray Physics, - (2013) = Dissertation, University of Goettingen, 2012

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2017-11-14
13:55
OpenAccess [PUBDB-2017-11977] Book/Dissertation / PhD Thesis
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Phase retrieval for object and probe in the optical near-field
Göttingen : Göttingen University Press, Göttingen Series in X-ray Physics; 18, 166 pp. (2016) [10.3204/PUBDB-2017-11977] = Dissertation, University of Goettingen, 2015  GO
ddc:530
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 wave front impinging on the sample is needed [...]
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2017-11-14
13:50
OpenAccess [PUBDB-2017-11975] Book/Dissertation / PhD Thesis
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X-ray waveguide optics: Beyond straight channels
Göttingen : Göttingen University Press, Göttingen Series in X-ray Physics, 122 pp. (2017) [10.3204/PUBDB-2017-11975] = Dissertation, University of Goettingen, 2016  GO
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, ensuring small focal spot dimensions simultaneously with high photon densities [...]
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2017-11-14
13:47
OpenAccess [PUBDB-2017-11973] Book/Dissertation / PhD Thesis
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Advanced x-ray multilayer waveguide optics
Göttingen : Göttingen University Press, Göttingen Series in X-ray Physics, 152 pp. (2017) [10.3204/PUBDB-2017-11973] = Dissertation, University of Goettingen, 2017  GO
The aim of this thesis is to demonstrate that x-ray waveguide optics can be gen- eralized from a single guiding film to an array of planar waveguides, enabling more complex and controllable phenomena of field propagation both in partic- ular in the near-field in the vicinity of objects to be probed by coherent imaging. Two advanced x-ray multilayer waveguides (MWGs) structures, i.e [...]
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2017-11-14
13:43
OpenAccess [PUBDB-2017-11971] Book/Dissertation / PhD Thesis
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X-Ray Near-Field Holography: Beyond Idealized Assumptions of the Probe
Göttingen : Göttingen University Press, Göttingen Series in X-ray Physics, 138 pp. (2017) [10.3204/PUBDB-2017-11971] = Dissertation, University of Goettingen, 2017  GO
All images are flawed, no matter how good your lenses, mirrors etc. are [...]
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