Electron emission

Short description: Ejection of an electron from the surface of matter, or atomic nucleus

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.

## Contents

* 1 Radioactive decay
* 2 Surface emission
* 2.1 Devices
* 3 Others
* 4 See also
* 5 References

## Radioactive decay

Main article: Physics: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

Main articles: Physics:Thermionic emission and Physics: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

Main article: Physics: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

## References

1. ↑ "Electron Emission: What is it & Types of Electron Emission | Electrical4U". https://www.electrical4u.com/electron-emission/.

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