Atomic holography with electrons and x-rays: Theoretical and experimental studies

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Gabor first proposed holography in 1948 as a means to experimentally record the amplitude and phase of scattered wavefronts, relative to a direct unscattered wave, and to use such a {open_quotes}hologram{close_quotes} to directly image atomic structure. But imaging at atomic resolution has not yet been possible in the way he proposed. Much more recently, Szoeke in 1986 noted that photoexcited atoms can emit photoelectron of fluorescent x-ray wavefronts that are scattered by neighboring atoms, thus yielding the direct and scattered wavefronts as detected in the far field that can then be interpreted as holographic in nature. By now, several algorithms ... continued below

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282 p.

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Len, P.M. June 1, 1997.

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This thesis or dissertation is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this document can be viewed below.

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  • Len, P.M. Univ. of California, Davis, CA (United States). Dept. of Physics

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Description

Gabor first proposed holography in 1948 as a means to experimentally record the amplitude and phase of scattered wavefronts, relative to a direct unscattered wave, and to use such a {open_quotes}hologram{close_quotes} to directly image atomic structure. But imaging at atomic resolution has not yet been possible in the way he proposed. Much more recently, Szoeke in 1986 noted that photoexcited atoms can emit photoelectron of fluorescent x-ray wavefronts that are scattered by neighboring atoms, thus yielding the direct and scattered wavefronts as detected in the far field that can then be interpreted as holographic in nature. By now, several algorithms for directly reconstructing three-dimensional atomic images from electron holograms have been proposed (e.g. by Barton) and successfully tested against experiment and theory. Very recently, Tegze and Faigel, and Grog et al. have recorded experimental x-ray fluorescence holograms, and these are found to yield atomic images that are more free of the kinds of aberrations caused by the non-ideal emission or scattering of electrons. The basic principles of these holographic atomic imaging methods are reviewed, including illustrative applications of the reconstruction algorithms to both theoretical and experimental electron and x-ray holograms. The author also discusses the prospects and limitations of these newly emerging atomic structural probes.

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282 p.

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INIS; OSTI as DE98000102

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  • Other Information: TH: Thesis (Ph.D.)

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  • Other: DE98000102
  • Report No.: LBNL--40560
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 539829
  • Archival Resource Key: ark:/67531/metadc696937

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  • June 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Aug. 4, 2016, 6:54 p.m.

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Len, P.M. Atomic holography with electrons and x-rays: Theoretical and experimental studies, thesis or dissertation, June 1, 1997; California. (digital.library.unt.edu/ark:/67531/metadc696937/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.