Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 255 for “"X-ray Spectroscopy"”.
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High-resolution detectors for soft X-ray spectroscopy
Resonant Inelastic X-ray Scattering (RIXS) is a modern soft X-ray spectroscopy technique used to investigate the structure of and excitations in materials. It requires high resolution spectrometers and a brilliant, tunable, X-ray source and therefore is carried out at spectrometers such as SAXES at …
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Studying Accretion Disc Winds with X-ray Spectroscopy
… including supermassive black holes, classical X-ray binaries and Ultraluminous X-ray sources. Outflows form a ubiquitous and important part of the accretion flow, carrying away a considerable fraction of the originally infalling mass. With velocities as high as 30 per cent of the speed of light, …
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X-ray Spectroscopy of Cool Core Galaxy Clusters
… However, early studies using high resolution X-ray spectroscopy indicated much lower levels of cooling rate. AGN feedback is thought to be the most likely energy source to balance radiative cooling, though the energy transport and dissipation mechanisms are still under debate. In this work, I …
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X-ray spectroscopy of low-mass X-ray binaries
I present high-resolution X-ray grating spectroscopy of neutron stars in low-mass X-ray binaries (LMXBs) using instruments onboard the Chandra X-ray Observatory and the X-ray Multi-Mirror Mission (XMM-Newton). The first part of this thesis concentrates on results from the subset of LMXBs with …
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Precision X-ray spectroscopy of 3C 273 jet knots
We present results from precision X-ray spectroscopy using high-resolution ([delta lambda] = 0.01A) spectra of 3C 273 jet knots extracted from eight observations made using Chandra in conjunction with the HETGS. Using these spectra we searched for narrow emission line candidates and, based on …
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Imaging X-ray spectroscopy with micro-X and Chandra
High spectral resolution observations of X-ray phenomena have the potential to uncover new physics. Currently, only point sources can be probed with high resolution spectra, using gratings. Extended objects like supernova remnants cannot be dispersed, leaving the dense forest of emission lines …
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High precision x-ray spectroscopy on highly charged argon ions
… two beams of visible light reflected on the x-ray crystal to mark the x-ray reflection position. The need for collimating entrance slits causing unacceptable x-ray flux losses is thereby avoided. Relative uncertainties of better than $\Delta \lambda / \lambda < 10^{-5}$ were achieved in the …
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Characterization of Alumina-Supported Molybdenum-Iridium Clusters (x-Ray, Spectroscopy)
Heteronuclear organometallic compounds have recently gained attention as precursors in heterogeneous catalysis. They have the potential of controlling surface metal particle size and stoichiometry. This may allow one to more efficiently study the role of components in heterogenous catalysts and …
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X-ray spectroscopy of neutron star low-mass X-ray binaries
… of topics relating to neutron star lowmass X-ray binaries (LMXBs) and utilize spectral information from X-ray observations to further our understanding of these sources. First, I give an overview of important X- ray astrophysics relevant to the work I present in subsequent chapters, as well as …
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Ultrafast optical and X-ray spectroscopy of strongly cooperative spin-crossover nanoparticles
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01
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Fabrication of critical-angle transmission gratings for high efficiency x-ray spectroscopy
… broadly utilized in many applications including spectroscopy, microscopy, and interferometry. As high-energy electromagnetic waves, such as extreme ultraviolet (EUV) and x rays, are of interest in various science fields including astrophysics, fine pitch gratings with high diffraction efficiency …
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Optical and core-level X-ray spectroscopy of correlated two-dimensional materials
… the utility and complementarity of resonant X-ray spectroscopy and symmetry-selective optical probes in combination with appropriate external tuning parameters (e.g. strain, pressure, ligand substitution, layer number) for revealing the origin of correlated phases in low-dimensional vdW …
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Transmission diffraction gratings for soft x-ray spectroscopy and spatial period division
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1982.
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Magnetic coupling in (GaMn)As ferromagnetic semiconductors – studied by soft x-ray spectroscopy
Durch die Dotierung von Gallium Arsenid mit Mangan werden lokale magnetische Momente implantiert und gleichzeitig Ladungsträger (Valenzband Löcher) erzeugt, welche eine langreichweitige ferromagnetische Kopplung zwischen den einzelnen Mangan Ionen herstellen können. In dieser Arbeit wurde die …
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Unveiling fundamental physics with high-resolution X-ray spectroscopy of Active Galactic Nuclei.
… thesis explores the use of high-resolution spectroscopy of active galactic nuclei (AGNs) to probe fundamental physics. It focuses on the study of axion-like particles (ALPs) and the spin of supermassive black holes (SMBHs). Chapter 1 starts with a review of black holes as mathematical and …
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Plasma characterisation of an electron cyclotron resonance ion source by means of x-ray spectroscopy
The ultimate aim of any multiply-charged ion source, like the Electron Cyclotron Resonance Ion Source, ECRIS, is the production of multiply-charged ions, in sufficiently large quantities. These multiplycharged ions, in the case of the ECRIS, are created by a step-by-step ionisation process, whereby …
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Atomic Level Study Of Water-Gas Shift Catalysts Via Transmission Electron Microscopy And X-Ray Spectroscopy
… by transmission electron microscopy andX-ray spectroscopy. The effect of the supporting phase and the use of secondary metals on the reaction kinetics is investigated. Structural heterogeneities are quantified and correlated with the kinetic descriptors ofthe catalysts to develop a …
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