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 24 for “"inelastic x-ray scattering"”.
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Resonant inelastic x-ray scattering from insulating cuprates
Submitted by Elizabeth Kent (eckent2@illinois.edu) on 2012-05-18T18:02:36Z No. of bitstreams: 1 1999_abbamonte.pdf: 3132117 bytes, checksum: 1f60d48ad29b3962a2b0f6de41a62941 (MD5)
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Inelastic X-ray scattering studies of broken symmetry in BSCCO
Interactions between charge and lattice degrees of freedom play a critical role in determining the properties of canonical BCS superconductors where integration out of the phonon subsystem results in an effective pairing interaction between electrons. In the study of high temperature …
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Direct Ion-Temperature Measurements Using High-Resolution Inelastic X-ray Scattering
… presents the development of a high-resolution inelastic-scattering platform capable of directly measuring ion temperature in HED matter. Designed for free-electron laser facilities, the platform uses a backscattering geometry to measure the ion velocity distribution. When the distribution …
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Charge structure of a quasiparticle in graphite measured with inelastic X-ray scattering
… spectra of graphite, which we measured using inelastic X-ray scattering at the Advanced Photon Source in Argonne, IL. The results are images of the anisotropic charge density cloud that surrounds a test charge to form quasiparticles in graphite. We are able to watch the anisotropic charge …
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Elastic and inelastic X-ray scattering studies of the low dimensional spin-1/2 quantum magnet TiOCl
… order phase transition. A detailed synchrotron x-ray study of the structure reveals the appearance of superlattice peaks at ( ... ) below 65 K. The intensity of the peaks drop very sharply above T, and a thermal hysteresis is observed which is consistent with a first order phase transition at 65 …
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Studies of structure and dynamics of biological macro-molecular assemblies by low angle neutron diffraction and inelastic X-ray scattering
… 40 wt% calfthymus Na-DNA molecules with the inelastic X-ray scattering (IXS). In the second part, we have developed a new efficient method to calculate the inter-particle structure factor in a simple fluid interacting with a two-Yukawa term potential and apply it to study the kinetic phase …
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Screening and the effective fine structure constant in graphene
… screening in graphene, and a new coherent inelastic x-ray scattering technique for attosecond resolution imaging of excitations in crystalline materials. The strength of electron-electron interactions in graphene is expected to be large due to the unusual dispersion relation of graphene’s …
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Experimental Investigation of Ultrafast Hydration Structure and Dynamics at Sub-Angstrom Lengthscales
This thesis outlines how meV-resolution inelastic x-ray scattering and causality-enforcing mathematics can be used to measure the dynamical density-density linear response function for liquid water with Angstrom spatial resolution and 50fs temporal resolution. The results are compared to …
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Elasticity measurements at extreme conditions: application to FeO and FeNi-alloy
… including ultrasonic interferometry and inelastic x-ray scattering methods. One of the most accurate techniques is high-frequency acoustic interferometry, which is capable for measuring sound wave velocities in very small samples under high pressures. The ultrasonic interferometry system …
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X-ray induced temperature dependent amorphous-amorphous transitions in the GeO2 glass
… thesis investigates the effects of intense X-ray irradiation on vitreous germanium dioxide (v-GeO2), a prototypical strong oxide glass, by combining X-ray photon correlation spectroscopy (XPCS), X-ray diffraction (XRD), and inelastic X-ray scattering (IXS). The results demonstrate that intense …
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Dynamical perspective of stability in glasses
… with thermo-mechanical treatments including X-ray irradiation and high-pressure compression. Vibrational dynamics are characterized through the vibrational density of states measured by Nuclear Resonant Analysis of Inelastic X-ray Scattering and Raman spectroscopy, while slow relaxation …
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Theoretical studies of structural and electronic properties in transition metal oxides
… studies are presented: theory of K-edge resonant inelastic x-ray scattering and its application for La_{0.5}Sr_{1.5}MnO_4, effects of rare earth ion size on the stability of the coherent Jahn-Teller distortions in undoped perovskite manganites, and symmetry-mode-based classical and quantum …
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Counterion Behavior in Biopolymers
… At the ~60 Å scale, we used small angle x-ray scattering to observe that the counterions in F-actin bundles adopt a periodic distribution, forming a one-dimensional charge density wave. At the ~5 Å scale, we used high-resolution inelastic x-ray scattering to observe inter-ion correlations. …
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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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Probing Entanglement and Symmetry Breaking Orders via Spectroscopies and Machine Learning
… relies on spectroscopies, including X-ray and neutron spectroscopies. Among different conceptual and mathematical formalisms of entanglement, multipartite entanglement has gained significance due to its accessibility through local probe techniques such as spectroscopies. The resonant …
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Dynamics of biopolymers and their hydration water studied by neutron and X-ray scattering
… their hydration water by means of neutron and X-ray scattering. We first approach this problem by studying the dynamics of hydration water and the dynamics of hydrated proteins respectively. We study the hydration water dynamics by using elastic neutron scattering (ENS) and quasielastic neutron …
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Novel magnetic and superconducting states in spin-1/2 kagome lattice and its doped variant
… I shall present the theoretical study of Raman scattering in the U(1) DSL state, which shows that in all symmetry channels the Raman intensity profiles contain broad continua that display power-law behaviors at low energy, which can be attributed to the excitations of spinon-antispinon pairs. …
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Neutron scattering investigations on the liquid-liquid transition in deeply cooled confined water
… in MCM-41 are investigated. With elastic neutron scattering, we measure the average density of the confined water at low temperatures and high pressures. The results show the existence of a first-order LDL-to-HDL transition in such system. The phase separation starts from 1.12 0.17 kbar and 215 1 …
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Understanding the intrinsic electrochemistry of ni-rich layered cathodes
… to no transition metals in the Li layer. X-ray spectroscopies are an ideal tool for studying cathodes at high states of delithiation due their elemental selectivity, range of probing depths, and sensitivity to both chemical and electronic state information. The oxidation state of the …
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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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