STEM microdiffraction studies from small gold particles grown by vacuum evaporation onto KC1 are reported. The patterns show kinematically forbidden spots which are sometimes as intense as the normal fcc spots. Particles with well defined shapes and wedges were studied by weak beam dark field techniques. Computer simulated patterns indicate that wedge-shaped crystals with surface vacancies and kinks produce forbidden reflections with intensities which are in agreement with the experimental observations. It is concluded that the forbidden spots are due to a combination of shape effects and surface roughness of the particles. Therefore microdiffraction patterns from individual particles can be used to evaluate surface roughness.
|Original language||English (US)|
|State||Published - Nov 1 1984|
ASJC Scopus subject areas
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry