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 198 for “"electron diffraction"”.
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Multivariate Analysis for Scanning (Transmission) Electron Diffraction
Scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM) are powerful and versatile techniques for materials science research. The technologies of beam control, aberration correction, signal collection, and data processing have all improved in recent years, leading to …
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Relativistic theory of low energy electron diffraction
… and further relativistic effects in the diffraction of low energy electrons (LEED) by crystals composed of heavy atoms, a relativistic dynamical theory is developed for calculating LEED intensities and spin polarizations. The presentation of the general framework of solving the boundary …
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Low-energy electron diffraction effects at complex interfaces
Low-energy electron scattering was used as a tool to study electron-stimulated processes at complex interfaces. The electron diffraction in each complex interface is theoretically treated by a multiple scattering formalism for quantitative analysis. Mathematical descriptions of electron-stimulated …
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Crystal Cartography: Mapping Nanostructure with Scanning Electron Diffraction
… up to micrometres. Recent developments in electron microscopy, enabling the acquisition of numerous diffraction patterns in a spatially resolved manner, combined with modern computational power, provides a route to meet this need as developed in this work. Scanning electron diffraction …
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Structure Solution Using Precession Electron Diffraction and Diffraction Tomography
This thesis concerns the application of electron diffraction to the problem of structure solution. The technique of precession electron diffraction, in particular, is discussed as a method to improve the applicability of methods borrowed from X-ray crystallography to intensities measured from …
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Characterization of metamict structures by electron diffraction and microscopy
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1994.
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Atomic structures of carbon nanomaterials studied by coherent electron diffraction
… as a difficult challenge in carbon nanoscience. Electron diffraction probes the local structure with electrons interacting with matters much more strongly compared to other structural probes. This thesis reports an investigation of atomic structures of various carbon nanoforms including graphene, …
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Methods and Applications for Nanometrology using Scanning Precession Electron Diffraction
Scanning electron diffraction offers researchers relatively easy access to the nanoscale and is often used to map sample properties in crystalline materials. Data quality can often be improved by introducing double conical rocking of the beam (commonly called precession). In this thesis, routes to …
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Spin-polarized low energy electron diffraction studies of Cu¿Au(001)
Combined measurements in low-energy electron diffraction of both intensity and diffracted electron spin-polarization are obtained for Cu,Au(1). Here the use of polarized LEED represents a refinement over standard LEED techniques because additional and complementary data is obtained. In addition, …
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Atomic Structures of Metallic and Semiconducting Nanocrystals by Coherent Electron Diffraction
The third application of the single-particle diffraction technique is to measure the temperature-dependent structures of individual nanocrystals. Again, Au nanocrystals were studied for this experiment. Experimentally, we recorded diffraction patterns from the same Au nanocrystals at different …
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High resolution low energy electron diffraction from the aluminum (100) surface
Submitted by Minhao Jiang (mjiang14@illinois.edu) on 2013-10-15T01:15:08Z No. of bitstreams: 1 1974_wendelken.pdf: 48332016 bytes, checksum: 65888f68d9f0a913d2d1284da874965a (MD5)
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Atomic structure characterization at the nanoscale using multi-modal electron diffraction
… opportunities, including applications in optoelectronics, renewable energy, medicine, and smart materials, as well as enabling continued miniaturization. Many unique phenomena at this intermediate length scale, between individual atoms and bulk materials, have been revealed through direct …
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Low-energy electron diffraction surface studies of II-VI semiconductor compounds.
Massachusetts Institute of Technology. Dept. of Chemistry. Thesis. 1968. Ph.D.
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Diffraction Between the Spots: Scanning Electron Diffraction of Beam-sensitive Disordered Materials
… distributions. Much of this can be gleaned from diffraction spots, but even more of the information lies in-between the spots in a diffraction pattern. The diffracted intensity outside of the diffracted spots contains the necessary information to not only obtain structural information, but to …
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Pharmaceuticals on the Nanoscale: Multi-dimensional Electron Diffraction of Organic Molecular Crystals
… industry include single crystal and powder X-ray diffraction alongside other bulk characterisation techniques. However, these techniques lack the ability to probe a sample on the nanoscale. Electron beams can be focused into nano-meter sized probes which means they can be used to study samples at …
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Quantitative analysis of crystal lattice and defects in nanoscale functional materials by electron diffraction
… material performance significantly. Transmission electron microscopy (TEM) has been one of best techniques to study crystalline defects due to its unparalleled spatial resolution. With the rapid advancements in electron detectors, data mining algorithms, and computation power for big data, a new …
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