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 44 for “"diffuse scattering"”.
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Disorder and diffuse scattering in single-chirality (TaSe4)2I crystals
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-12-01
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X-ray thermal diffuse scattering and its studies of lattice dynamics
X-ray scattering by lattice thermal vibrations give rise to thermal diffuse scattering (TDS). TDS contain valuable information about lattice dynamics of the scattering material. Historically, x-ray TDS was the first tool utilized by people in experimental determination of phonon dispersion …
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Electron diffuse-scattering fluctuation and correlation analysis in complex face-centered-cubic alloys via four-dimensional scanning transmission electron microscopy
… in alloys frequently relies on the analysis of diffuse-scattering signals recorded by electron diffraction, which provide valuable insights into the structural characteristics of ordering, including direction and periodicity. Among the various electron diffraction techniques available, …
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Atomic short-range order determination in gold-25 atomic percent iron and nickel-12.5 atomic percent silicon: A synchrotron x-ray diffuse scattering study
… Iron single crystal was studied using wide-angle diffuse synchrotron x-radiation scattering at room temperature. Two heat-treatments were investigated; a 400$\sp\circ$C aging treatment for two days and a second at 440$\sp\circ$C for five days, both preceded by solution treatment in the …
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Superlattice formation in group IV-B transition metal dichalcogenides
… forms in TiSe2 at low temperature. Strong diffuse scattering is observed above T. An optically active far-infrared lattice mode is observed which c breaks up into several additional modes below the phase transition. In the infrared study, there is a dramatic shift in the Drude edge as well …
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X-Ray and Neutron Scattering Studies of Niobium-Hydrogen Alloys Near the Alpha-Prime to Beta Phase Transition
… was conducted using x-ray and elastic neutron scattering techniques in the temperature range 300 < T < 473 K. Diffuse scattering close to the Bragg peaks of the BCC (alpha)' phase was measured. The temperature dependence of the scattering was determined in the (alpha)' phase and the changes in …
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Construction of an Optical Quarter-Wave Stack Using the ISAM (Ionic Self-Assembled Multilayers) Technique
… films were unsuccessful because of excess diffuse scattering due to inhomogeneities in the film. In order to reduce diffuse scattering, two approaches were considered. The first approach was to improve the deposition process itself by experimenting with different values of deposition …
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X-ray Studies of Lattice Dynamics
Analysis of thermal diffuse scattering of x-rays (TDS) has recently shown great promise as a tool for phonon studies, complementing more traditional neutron scattering techniques. Quasi-elastic x-ray scattering from thermally populated phonon modes has been used to study lattice dynamics and phonon …
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Crystalline Protein Dynamics : A Simulation Analysis of Staphylococcal Nuclease
… in terms of fluctuations, correlations, X-ray diffuse scattering, disorder and models of protein motion. Convergence properties of dynamical quantities are determined. The logarithmic dependence on the simulation length of the R factor with the experimental X-ray diffuse scattering, which is …
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X-ray diffraction study of the high-density phases of solid 4He
… wave-vector transfer,q; study of the inelastic diffuse scattering to relate it to crystal elastic constants and other dynamical information; and lattice parameter measurements to study thermal defect properties. Analysis of the data indicate that the average displacement amplitudes are reduced …
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Characterization and Evaluation of Non-Line-of-Sight Paths for Fixed Broadband Wireless Communications
… show combinations of specular multipath and diffuse scattering at LMDS frequencies. An algorithm is presented that estimates link performance based on the channel impulse response. Presented and analyzed are representative impulse responses (one is primarily specular in nature and one shows …
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Algorithms for Reconstruction of hidden 3D shapes using diffused reflections
… the geometry of hidden objects from tertiary diffuse scattering, given time of flight information. We focus on using ultra high speed capture of photons to accurately determine information about distance light travelled and using it to infer hidden geometry. We aim at investigating issues such …
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Effective mobility in silicon surface channels as measured with the MOS transistor
… numerical calculations using the exact-field diffuse scattering theory exhibited a strong bulk doping dependence which was open to direct experimental verification. Theoretical extensions of the existing theory were accomplished through the direct integration of the Boltzmann equation. An …
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X-Ray Scattering Study of the Transition Dynamics in Relaxor Ferroelectric Lead (Magnesium(1/3) Niobium(2/3)) Oxygen(3) (Pmn)
Thermal diffuse scattering measurements were performed at several temperatures. A [011] transverse optic soft mode was determined to exist. The temperature dependence of this phonon mode was carefully studied as the transition is approached, and down to 40 K. The q-dependency of the freezing …
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Quantitative analysis of crystal lattice and defects in nanoscale functional materials by electron diffraction
… geometry and intensity of Bragg diffraction, and diffuse scattering in nanobeam diffraction. First, we develop a powerful and versatile technique for lattice strain mapping using SEND. The measurement of strain is based on determining the Bragg peak positions recorded in the diffraction patterns …
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X-ray diffraction study of aged copper beryllium alloys
… A simplified method of evaluating the thermal diffuse scattering and a method for calculating the diffuse scattering from polycrystalline materials with textures are also presented.
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Diffuse X-ray scattering from tropomyosin crystals
… in the crystal which profoundly affect the X-ray scattering are important. All motions in the crystal affect the Bragg scattering and also give rise to diffuse scattering between and surrounding the Bragg spots. The diffuse X-ray scattering may comprise a large part of the total scattering from …
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Investigations of electron scattering mechanisms at the silicon-silicon dioxide interface
… was conducted to determine the possible scattering mechanisms of electrons at the silicon-silicon dioxide interface. Theoretical surface conductivity mobility in a semiconductor space-charge region for the temperature range 1000K to 4000K was calculated using a classical Boltzmann-Fuchs …
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Phase transformations in highly electrostrictive and magnetostrictive crystals: structural heterogeneity and history dependent phase stability
… histories, using x-ray and neutron scattering techniques. In PMN-xPT crystals, x-ray and neutron diffractions were performed along the different crystallographic orientations and for different thermal and electrical histories. Various intermediate monoclinic (M) phases that …
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Real-Time Dynamics of Electrons and Phonons from First Principles
… where electron–phonon and phonon–phonon scatterings are explicitly computed from first principles without empirical parameters. The methodology is applied to photoexcited transition metal dichalcogenides, where the relaxation of these nonequilibrium states is shown to occur over hundreds …
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