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Digitale Medien

Preparation and characterization of MgO surfaces by reflection electron microscopy (1992)

Crozier, P. A. ; Gajdardziska-Josifovska, M. ; Cowley, J. M.

New York, NY [u.a.] : Wiley-Blackwell

Microscopy Research and Technique 20 (1992), S. 426-438

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ISSN: 1059-910X

Schlagwort(e): Reflection high energy electron diffraction ; Surface topography ; Chemical polishing ; Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Allgemeine Naturwissenschaft

Notizen: We have employed several different methods to prepare (100) and (111) surfaces of MgO crystals. (100) surfaces prepared by simple cleaving give good reflection high energy electron diffraction (RHEED) patterns and surfaces with a high density of coarse steps. Chemical polishing of this surface results in a roughening of the topography whilst annealing in oxygen considerably smoothens the surfaces although they appear to be contaminated. Under certain conditions we find that the MgO crystals will cleave along the (111) plane. Both cleaved and mechanically polished (111) surfaces are atomically flat and reconstructed after oxygen annealing.

Zusätzliches Material: 12 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jemt.1070200412

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Digitale Medien

A simplified mode of differential phase contrast lorentz microscopy (1993)

Kraut, S. ; Cowley, J. M.

New York, NY [u.a.] : Wiley-Blackwell

Microscopy Research and Technique 25 (1993), S. 341-345

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ISSN: 1059-910X

Schlagwort(e): Magnetic domains ; Thin films ; Iron ; Cobalt ; Scanning transmission electron microscopy ; Annular detector ; Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Allgemeine Naturwissenschaft

Notizen: A simplified mode of differential phase contrast Lorentz microscopy for the study of magnetic domain structures in thin films is proposed and demonstrated. This mode employs a single annular detector in a scanning transmission electron microscope rather than the specialized split detectors that have been previously used. The resulting signal is sufficiently linear with magnetic field strength to allow quantitative data to be obtained on the domain configurations and the natures of the domain walls. © 1993 Wiley-Liss, Inc.

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jemt.1070250411

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Digitale Medien

Electron diffraction phenomena observed with a high resolution STEM instrument (1986)

Cowley, J. M.

New York, NY : Wiley-Blackwell

Journal of Electron Microscopy Technique 3 (1986), S. 25-44

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ISSN: 0741-0581

Schlagwort(e): Electron diffraction ; Scanning transmission electron microscopy ; Microdiffraction ; In-line holography ; Small particles ; Crystal structure ; Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Allgemeine Naturwissenschaft

Notizen: Because of the high brightness of the cold field emission source used in a dedicated scanning transmission electron microscopy (STEM) instrument, it is possible to focus electrons to a cross-over of width 3Å or less and, with a suitable detection system, to obtain diffraction patterns from specimen regions of this size or greater. Coherent interference effects are visible in shadow images (in-line holograms) and in convergent beam diffraction patterns. Special techniques have been developed for gathering information from the diffraction patterns for application to the study of the structures of crystal defects, crystal surfaces and small particles. Possibilities have been explored for holographic reconstruction from shadow images.

Zusätzliches Material: 14 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jemt.1060030105

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Digitale Medien

Observation of microdiffraction patterns with a dedicated STEM instrument (1989)

Cowley, J. M. ; Ou, H.-J.

New York, NY : Wiley-Blackwell

Journal of Electron Microscopy Technique 11 (1989), S. 143-154

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ISSN: 0741-0581

Schlagwort(e): Detector systems for microdiffraction ; STEM imaging ; Coherent diffraction effects ; Image reconstruction from diffraction patterns ; EELS ; SEM ; Life and Medical Sciences ; Cell & Developmental Biology

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Allgemeine Naturwissenschaft

Notizen: A two-dimensional detector system, designed for the observation and recording of microdiffraction patterns formed in an HB 5 scanning transmission electron microscope (STEM) is described and discussed. Possibilities are described and demonstrated for the simultaneous or successive recording of microdiffraction patterns from regions of diameter 3 å or more, bright- or dark-field STEM images, EELS spectra, secondary electron images, and in-line holograms. Applications of the system have been made to studies of catalyst particles, reflection-mode imaging of bulk surfaces, and image reconstruction from microdiffraction patterns obtained from each point of a STEM image.

Zusätzliches Material: 9 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jemt.1060110209

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