BRAINCAKEElectron Excitation by Collisions
When gas particles collide with electrons if there is not enough energy for ionisation at certain energies excitation occurs.
If no excitation, then the particles are deflected with no loss of kinetic energy.
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Key terms in this lesson
- Electron volt
- The energy transferred when an electron moves through a potential difference of one volt, equal to 1.6 times ten to the minus 19 joules.
- Photon
- A discrete packet, or quantum, of electromagnetic energy.
- Ionisation
- The removal of one or more electrons from a neutral atom, or the addition of electrons, to form an ion.
More in The Photoelectric Effect
- The Vacuum Photocell
- Ionisation
- Measuring Ionisation Energy
- Energy of Electrons
- Excitation Using Photons
- De-excitation
- Fluorescence
- Fluorescent Tube
All 19 lessons in The Photoelectric Effect · All AQA AS-level Physics topics