Emission coefficient
From Wikipedia, the free encyclopedia
Emission coefficient is a coefficient in the power output per unit time of an electromagnetic source, a calculated value in physics. It is also used as a measure of environmental emissions (by mass) per MWh of electricity generated, see: Emission factor.
Contents |
[edit] Scattering of light
In Thomson scattering a charged particle emits radiation under incident light. The particle may be an ordinary atomic electron, so emission coefficients have practical applications.
If X dV dΩ dλ is the energy scattered by a volume element dV into solid angle dΩ between wavelengths λ and λ+dλ per unit time then the Emission coefficient is X.
The values of X in Thomson scattering can be predicted from incident flux, the density of the charged particles and their Thomson differential cross section (area/solid angle).
[edit] Spontaneous Emission
A warm body emitting photons has a monochromatic emission coefficient relating its temperature and total power radiation, this is sometimes called the second "Einstein coefficient", and can be deduced from quantum mechanical theory.
[edit] See also
- The Diode equation includes the emission coefficient
- Plasma physics.
- An emission coefficient is also given for ballistic secondary electron emission.
- Luminous coefficient
[edit] External links
 |
This atomic, molecular, and optical physics-related article is a stub. You can help Wikipedia by expanding it. |
