Electron Diffraction
Electron Diffraction
- The gap between atoms in Carbon is just the right width for electrons to diffract.
- This means we can use allotropes of carbon such as graphene or graphite to diffract electrons.
The practical
- A current goes through a filament causing thermionic emmission of electrons.
- Those electrons are accellerated through a high potential difference into graphite (or another carbon allatrope) which acts as a diffraction grating.
- Emmission shown by electrons passing energy to excite electrons in flourecent paint at end of the evacuated chamber.
- The excited electrons drop energy levels and emit photons with energies equaivilent to energy change in drops.
- This is similar to the Diffraction Gratings in the waves topic.