Physical Properties of Surfaces by Electron Diffraction.
Final scientific rept. 1 Jan 71-31 May 76,
ARIZONA STATE UNIV TEMPE DEPT OF PHYSICS
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A dynamical diffraction theory for electron diffraction from surfaces has been developed and used to calculate diffraction intensities and image contrast. An experimental system has been constructed for the examination of the surface structure of crystals, combining medium energy electron diffraction with scanning electron microscopy. A new technique, involving the use of diffracted electron beams to provide dark-field scanning images of the surfaces of crystals, has been introduced, evaluated theoretically and demonstrated experimentally as a means for the detection of crystal imperfections and structural modifications. Applications of this new technique, in combination with diffraction and conventional, secondary-electron scanning electron microscopy have been made to the study of the structure of the surfaces of several materials, to the oxidation of copper crystals and to a precipitation of one phase from solid solution.
- Nuclear Physics and Elementary Particle Physics