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- Field_emission_gun abstract "A field emission gun is a type of electron gun in which a sharply pointed Müller-type emitter is held at several kilovolts negative potential relative to a nearby electrode, so that there is sufficient potential gradient at the emitter surface to cause field electron emission. Emitters are either of cold-cathode type, usually made of single crystal tungsten sharpened to a tip radius of about 100 nm, or of the Schottky type, in which thermionic emission is enhanced by barrier lowering in the presence of a high electric field. Schottky emitters are made by coating a tungsten tip with a layer of zirconium oxide, which has the unusual property of increasing in electrical conductivity at high temperature. In electron microscopes, a field emission gun is used to produce an electron beam that is smaller in diameter, more coherent and with up to three orders of magnitude greater current density or brightness than can be achieved with conventional thermionic emitters such as tungsten or lanthanum hexaboride (LaB6)-tipped filaments. The result in both scanning and transmission electron microscopy is significantly improved signal-to-noise ratio and spatial resolution, and greatly increased emitter life and reliability compared with thermionic devices.".
- Field_emission_gun wikiPageID "2265023".
- Field_emission_gun wikiPageLength "1622".
- Field_emission_gun wikiPageOutDegree "18".
- Field_emission_gun wikiPageRevisionID "615726618".
- Field_emission_gun wikiPageWikiLink Category:Tungsten.
- Field_emission_gun wikiPageWikiLink Category:Vacuum_tubes.
- Field_emission_gun wikiPageWikiLink Cold-cathode.
- Field_emission_gun wikiPageWikiLink Cold_cathode.
- Field_emission_gun wikiPageWikiLink Electrical_conductivity.
- Field_emission_gun wikiPageWikiLink Electrical_resistivity_and_conductivity.
- Field_emission_gun wikiPageWikiLink Electrode.
- Field_emission_gun wikiPageWikiLink Electron_gun.
- Field_emission_gun wikiPageWikiLink Electron_microscope.
- Field_emission_gun wikiPageWikiLink Field_electron_emission.
- Field_emission_gun wikiPageWikiLink Gradient.
- Field_emission_gun wikiPageWikiLink Lanthanum_hexaboride.
- Field_emission_gun wikiPageWikiLink Potential.
- Field_emission_gun wikiPageWikiLink Scanning_electron_microscope.
- Field_emission_gun wikiPageWikiLink Signal-to-noise_ratio.
- Field_emission_gun wikiPageWikiLink Thermionic_emission.
- Field_emission_gun wikiPageWikiLink Transmission_electron_microscope.
- Field_emission_gun wikiPageWikiLink Transmission_electron_microscopy.
- Field_emission_gun wikiPageWikiLink Walter_H._Schottky.
- Field_emission_gun wikiPageWikiLink Zirconium_dioxide.
- Field_emission_gun wikiPageWikiLink Zirconium_oxide.
- Field_emission_gun wikiPageWikiLinkText "Field emission gun".
- Field_emission_gun wikiPageWikiLinkText "field emission electron gun".
- Field_emission_gun wikiPageWikiLinkText "field emission gun".
- Field_emission_gun date "July 2014".
- Field_emission_gun hasPhotoCollection Field_emission_gun.
- Field_emission_gun reason "what is this?".
- Field_emission_gun wikiPageUsesTemplate Template:Chem.
- Field_emission_gun wikiPageUsesTemplate Template:Clarify.
- Field_emission_gun wikiPageUsesTemplate Template:Reflist.
- Field_emission_gun wikiPageUsesTemplate Template:Tech-stub.
- Field_emission_gun wikiPageUsesTemplate Template:Unreferenced.
- Field_emission_gun subject Category:Tungsten.
- Field_emission_gun subject Category:Vacuum_tubes.
- Field_emission_gun hypernym Gun.
- Field_emission_gun type Article.
- Field_emission_gun type Weapon.
- Field_emission_gun type Article.
- Field_emission_gun type Component.
- Field_emission_gun type Element.
- Field_emission_gun comment "A field emission gun is a type of electron gun in which a sharply pointed Müller-type emitter is held at several kilovolts negative potential relative to a nearby electrode, so that there is sufficient potential gradient at the emitter surface to cause field electron emission.".
- Field_emission_gun label "Field emission gun".
- Field_emission_gun sameAs تفنگ_الکترونی_گسیل_میدانی.
- Field_emission_gun sameAs Canhão_de_emissão_de_campo.
- Field_emission_gun sameAs m.06_96j.
- Field_emission_gun sameAs Q5446996.
- Field_emission_gun sameAs Q5446996.
- Field_emission_gun wasDerivedFrom Field_emission_gun?oldid=615726618.
- Field_emission_gun isPrimaryTopicOf Field_emission_gun.