| EPSRC Reference: |
GR/H92838/01 |
| Title: |
STUDY OF MATERIALS BY COHERENT ELECTRON DIFFRACTION AND BY ELECTRON HOLOGRAPHY |
| Principal Investigator: |
Vincent, Dr R |
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| Department: |
Physics |
| Organisation: |
University of Bristol |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 April 1993 |
Ends: |
31 December 1996 |
Value (£): |
133,313
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Summary on Grant Application Form |
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Recent experiments have shown that the Hitachi HF-2000 electron microscope equipped with a cold field emission source provides a coherent beam with a minimum probe size of 0.6nm. The overlaps between adjacent discs in convergent beam patterns show interference fringes that directly phase the reflections, both in low order reflections and in higher order Laue zone reflections excited around a zone axis. The angular field included within the overlap region is expanded by a large angle technique, where an aperture limits the number of beams that contribute to the interference pattern. We plan to study coherent diffraction contrast in crystals where the focused probe size is smaller than the unit cell, with the aim of structure determination for new metastable phases. As an alternative to electron holography in diffraction space, off-axis holograms in real space will be produced by interfering beams with a biprism, where the proposed reference fringe spacing of 1+ is equivalent to a spatial resolution of 3+. Applications include mapping of piezo-electric and magnetic fields in semiconductors and measurement of shifts in the inner potential across interfaces in semiconductor multilayers and at boundaries with amorphous layers.
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Key Findings |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Potential use in non-academic contexts |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
| Summary |
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| Date Materialised |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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| Project URL: |
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| Further Information: |
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| Organisation Website: |
http://www.bris.ac.uk |