Sentence examples for secondary emission from inspiring English sources
noun
The emission of electrons from the surface of a solid when bombarded with electrons or other charged particles
Secondary emission also can occur in insulators.
The ratio of secondary electrons to incident electrons is known as the secondary emission coefficient.
Because many insulators have rather high secondary emission coefficients, it is often useful when high secondary emission yields are required to coat a metal electrode with a thin insulator layer a few atoms thick.
The positive electrode, or collector, located beyond the catcher collects the electrons; it is designed to minimize secondary emission.
Secondary emission, ejection of electrons from a solid that is bombarded by a beam of charged particles.
Ions, too, may be ejected from solids by secondary emission produced when positive ions bombard their surfaces.
Thus, any electrons emitted from the plate surface by secondary emission are repelled back to the plate.
The secondary emission coefficients fall and, when the electrons have energies exceeding 20 kiloelectron volts, are usually well below unity.
The amount of secondary emission depends on the properties of the material and the energy and angle of incidence of the primary electrons.
Material properties are characterized by the secondary-emission ratio, defined as the number of secondary electrons emitted per primary electron.
Typically, the maximum secondary-emission ratio lies between 0.5 and 1.5 for pure metals and occurs for incident electron energies between 200 and 1,000 eV.
