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.

Radioactive decay

 * 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

Surface emission

 * Thermionic emission, the liberation of electrons from an electrode by virtue of its temperature
 * Schottky emission, due to the:
 * Schottky effect or field enhanced thermionic emission
 * Field electron emission, emission of electrons induced by an electrostatic field

Devices

 * An electron gun or electron emitter, is an electrical component in some vacuum tubes that uses surface emission

Others

 * Exoelectron emission, a weak electron emission, appearing only from pretreated objects
 * Photoelectric effect, the emission of electrons when electromagnetic radiation, such as light, hits a material