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Concept

Electron emission

In physics, electron emission is the ejection of an electron from the surface of matter, 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.

Official source

https://en.wikipedia.org/wiki/Electron_emission

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Thermionic emission

Thermionic emission (also known as thermal electron emission or the Edison effect) is the liberation of electrons from an electrode by virtue of its temperature (releasing of energy supplied by heat). This occurs because the thermal energy given to the charge carrier overcomes the work function of the material. The charge carriers can be electrons or ions, and in older literature are sometimes referred to as thermions. After emission, a charge that is equal in magnitude and opposite in sign to the total charge emitted is initially left behind in the emitting region.

Official source

https://en.wikipedia.org/wiki/Electron_emission

About this result

Related lectures (8)

Advanced SEM Technologies and Examples

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Thermionic emission