42 lines
1.5 KiB
Markdown
42 lines
1.5 KiB
Markdown
---
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title: "Electron emission"
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chunk: 1/1
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source: "https://en.wikipedia.org/wiki/Electron_emission"
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category: "reference"
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tags: "science, encyclopedia"
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date_saved: "2026-05-05T10:55:07.536321+00:00"
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instance: "kb-cron"
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---
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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.
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== Radioactive decay ==
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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
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== Surface emission ==
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Thermionic emission, the liberation of electrons from an electrode by virtue of its temperature
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Schottky emission, due to the:
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Schottky effect or field enhanced thermionic emission
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Field electron emission, emission of electrons induced by an electrostatic field
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=== Devices ===
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An electron gun or electron emitter, is an electrical component in some vacuum tubes that uses surface emission
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== Others ==
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Exoelectron emission, a weak electron emission, appearing only from pretreated objects
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Photoelectric effect, the emission of electrons when electromagnetic radiation, such as light, hits a material
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== See also ==
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Positron emission, (of a positron or "antielectron") is one aspect of β+ decay
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Electron excitation, the transfer of an electron to a higher atomic orbital
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== References == |