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Showing 1 to 20 of 378 for “"X-ray Scattering"”.
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Quasi-elastic resonant x-ray scattering
In the fast collision approximation, the scattering amplitude operator of the quasi-elastic scattering is expressed as the summation of multipole moment operators $M\sp{(k)}(l\sb{i},s\sb{i})$ of the valence shell involved in the resonance$\sp1$ with distinct polarization factors. Each multipole …
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Diffuse X-ray scattering from tropomyosin crystals
… an understanding of the protein dynamics. X-ray crystallography is the technique used in the majority of protein structure determinations; from a crystallographic standpoint as well, the movement of the molecules in the crystal which profoundly affect the X-ray scattering are important. All …
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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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An x-ray scattering study of surfactant water mixtures
The occurrence of nematic and lamellr mesophases in concentrated surfactant / water mixtures is a well documented phenomenon. This work examines the structure and order of the mesophases exhibited by two sample systems, caesium pentadecafluorooctanoa-te (CsPFO) / heavy water, and decylammonium …
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Neutron and x-ray scattering studies of layered solids
We report inelastic and quasielastic neutron scattering studies of graphite intercalation compounds and x-ray scattering studies of semiconductor films and superlattices which were grown by molecular beam epitaxy. For graphite intercalation compounds, these include measurements of the [00 1] …
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Structural analysis of nanoparticles by small angle X-ray scattering
… particles by the combination of small angle x-ray scattering (SAXS), electron microscopy (TEM and cryo-TEM) and dynamic light scattering (DLS). Two systems with totally di_erent morphologies and compositions have been investigated: spherical particles of calcium-phosphate-protein complexes and …
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Model X-ray scattering behaviour of arrays of structured cylinders.
The model X-ray scattering behaviour of hexagonal arrays of infinitely long cylinders with various internal structures is considered by regarding the model as a function of three parameters, viz: the cylinder's scattering function, the swelling factor (Y), and the lattice interference function. The …
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X-ray Scattering Study Of Capillary Condensation In Mesoporous Silica
… inside the pores. In-situ small and wide angle x-ray scattering(S/WAXS) were used to study the deformation with respect to relative vapor pressure of the fluid. Periodic mesoporous silica such as MCM-41 and SBA-15 were synthesized and used as the samples with water as the capillary condensation …
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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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X-Ray scattering investigations of subtle ordering in correlated materials
… change. Additionally, torque magnetometry and x-ray diffraction suggest a breaking of C4 rotational symmetry. We directly study the lattice through x-ray scattering. We see no change of the acoustic phonon dispersions or of the phonon lifetimes from the HO transition. Calculations of phonon …
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X-ray scattering and molecular modeling of novel semicrystalline polyimides
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1994.
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Direct Ion-Temperature Measurements Using High-Resolution Inelastic X-ray Scattering
… 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 follows …
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Structural Analysis of Cylindrical Particles by Small Angle X-ray Scattering
… cylindrical particles by small angle X-ray scattering (SAXS). Three systems with cylinder-shaped particles: (1) Laponite particles in aqueous solutions, (2) Poly(carbon suboxide) particles in binary water/DMF solutions, and (3) Suprastructural aggregates of coil-ring-coil block …
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Grazing Incidence X-ray Scattering from Magnetic Thin Films and Nanostructures
Grazing incidence scattering of synchrotron x-rays has been used to characterize the structure of magnetic thin films and periodic nanostructures. The combined metal and metal oxide films have been chosen to clarify the effects of growth processing techniques in technologically important magnetic …
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Investigation of Phase-Separated Polymeric Materials via X-ray Scattering Techniques
… via ultra-small, small, and wide-angle X-ray scattering methods (USAXS/SAXS/WAXS). Specifically, these experimental techniques are employed to investigate the phase separated morphologies that impart unique properties to each class of materials and allow for their use in advanced …
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Designing a nanoscale x-ray source: towards single molecule x-ray scattering
… the design and construction of a femtosecond X-ray source based on high harmonic generation in an argon filled hollow capillary waveguide. The system has demonstrated excellent efficiency at generating harmonics in the range 20-50 eV and is tuneable by exploiting the ionization-induced …
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Hypersound interaction studied by time-resolved inelastic light and x-ray scattering
… ultrafast variants of optical Brillouin and x-ray scattering. Here an incident optical or x-ray photon is scattered by the excited sound wave in the sample. The scattered light intensity measures the occupation of the phonon modes. The central part of this work is the investigation of coherent …
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X-ray scattering studies of self-organized nanoscale-structures on semiconductor surfaces
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1998.
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Investigating Interstellar dust in the Milky Way through X-ray scattering and absorption
… studies of the cosmic microwave background. In X-ray astronomy, dust impacts observations by both absorbing and scattering photons. Despite extensive studies at multiple wavelengths, several fundamental aspects of interstellar dust—its composition, size distribution, and large-scale spatial …
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