What does thermionic emission mean?
Definitions for thermionic emission
thermion·ic emis·sion
This dictionary definitions page includes all the possible meanings, example usage and translations of the word thermionic emission.
Princeton's WordNet
thermionic emission, thermal emissionnoun
the emission of electrons from very hot substances
Wikidata
Thermionic emission
Thermionic emission is the heat-induced flow of charge carriers from a surface or over a potential-energy barrier. This occurs because the thermal energy given to the carrier overcomes the binding potential, also known as work function of the metal. The charge carriers can be electrons or ions, and in older literature are sometimes referred to as "thermions". After emission, a charge will initially be left behind in the emitting region that is equal in magnitude and opposite in sign to the total charge emitted. But if the emitter is connected to a battery, then this charge left behind will be neutralized by charge supplied by the battery, as the emitted charge carriers move away from the emitter, and finally the emitter will be in the same state as it was before emission. The thermionic emission of electrons is also known as thermal electron emission. The classical example of thermionic emission is the emission of electrons from a hot cathode, into a vacuum in a vacuum tube. The hot cathode can be a metal filament, a coated metal filament, or a separate structure of metal or carbides or borides of transition metals. Vacuum emission from metals tends to become significant only for temperatures over 1000 K. The science dealing with this phenomenon has been known as thermionics, but this name seems to be gradually falling into disuse.
Matched Categories
Numerology
Chaldean Numerology
The numerical value of thermionic emission in Chaldean Numerology is: 3
Pythagorean Numerology
The numerical value of thermionic emission in Pythagorean Numerology is: 1
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"thermionic emission." Definitions.net. STANDS4 LLC, 2024. Web. 2 May 2024. <https://www.definitions.net/definition/thermionic+emission>.
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