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- Thermionic_emission abstract "Thermionic emission of electrons is also known as thermal electron emission, and 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 classical example of thermionic emission is the emission of electrons from a hot cathode into a vacuum (also known as the Edison effect) 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. Template:Whom?The term "thermionic emission" is now also used to refer to any thermally-excited charge emission process, even when the charge is emitted from one solid-state region into another. This process is crucially important in the operation of a variety of electronic devices and can be used for electricity generation (e.g., thermionic converters and electrodynamic tethers) or cooling. The magnitude of the charge flow increases dramatically with increasing temperature.".
- Thermionic_emission thumbnail Thermionic_filament.jpg?width=300.
- Thermionic_emission wikiPageExternalLink tubes201.
- Thermionic_emission wikiPageExternalLink richardson-lecture.pdf.
- Thermionic_emission wikiPageExternalLink thermionic.pdf.
- Thermionic_emission wikiPageID "215226".
- Thermionic_emission wikiPageRevisionID "603786667".
- Thermionic_emission hasPhotoCollection Thermionic_emission.
- Thermionic_emission subject Category:Atomic_physics.
- Thermionic_emission subject Category:Electricity.
- Thermionic_emission subject Category:Energy_conversion.
- Thermionic_emission subject Category:Thomas_Edison.
- Thermionic_emission subject Category:Vacuum_tubes.
- Thermionic_emission comment "Thermionic emission of electrons is also known as thermal electron emission, and 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".".
- Thermionic_emission label "Edison-Richardson-Effekt".
- Thermionic_emission label "Efeito termiônico".
- Thermionic_emission label "Effetto termoionico".
- Thermionic_emission label "Emisión termoiónica".
- Thermionic_emission label "Emisja termoelektronowa".
- Thermionic_emission label "Thermionic emission".
- Thermionic_emission label "Thermionische emissie".
- Thermionic_emission label "Thermoïonique".
- Thermionic_emission label "Термоэлектронная эмиссия".
- Thermionic_emission label "إشعاع تأين حراري".
- Thermionic_emission label "エジソン効果".
- Thermionic_emission label "热发射".
- Thermionic_emission sameAs Edison-Richardson-Effekt.
- Thermionic_emission sameAs Emisión_termoiónica.
- Thermionic_emission sameAs Thermoïonique.
- Thermionic_emission sameAs Effetto_termoionico.
- Thermionic_emission sameAs エジソン効果.
- Thermionic_emission sameAs 열전자_방출.
- Thermionic_emission sameAs Thermionische_emissie.
- Thermionic_emission sameAs Emisja_termoelektronowa.
- Thermionic_emission sameAs Efeito_termiônico.
- Thermionic_emission sameAs m.01fj03.
- Thermionic_emission sameAs Q215259.
- Thermionic_emission sameAs Q215259.
- Thermionic_emission wasDerivedFrom Thermionic_emission?oldid=603786667.
- Thermionic_emission depiction Thermionic_filament.jpg.
- Thermionic_emission isPrimaryTopicOf Thermionic_emission.
