Electron emission explained

In physics, electron emission is the ejection of an electron from the surface of matter,^[1] or, in beta decay (β− decay), where a beta particle (a fast energetic electron or positron) is emitted from an atomic nucleus transforming the original nuclide to an isobar.

Radioactive decay

See main article: Beta decay.

• In Beta decay (β− decay), radioactive decay results in a beta particle (fast energetic electron or positron in β+ decay) being emitted from the nucleus

Surface emission

See main article: Thermionic emission and Field electron emission.

• Thermionic emission, the liberation of electrons from an electrode by virtue of its temperature
  • Schottky emission, due to the:
    • Schottky effect or field enhanced thermionic emission
• Field electron emission, emission of electrons induced by an electrostatic field

Devices

See main article: electron gun.

• An electron gun or electron emitter, is an electrical component in some vacuum tubes that uses surface emission

Others

• Exoelectron emission, a weak electron emission, appearing only from pretreated objects
• Photoelectric effect, the emission of electrons when electromagnetic radiation, such as light, hits a material

See also

• Positron emission, (of a positron or "antielectron") is one aspect of β+ decay
• Electron excitation, the transfer of an electron to a higher atomic orbital

Notes and References

1. Web site: Electron Emission: What is it & Types of Electron Emission | Electrical4U. www.electrical4u.com.