Astrophysics (Index)About


(changing the direction of a particle's movement)

In physics, scattering means changing the direction of movement of a particle. The word is commonly used for the scattering of photons and electrons but also used for other particles. Photon scattering is considered one of the phenomena in radiative transfer (along with absorption and emission) and is sometimes equivalent to absorption followed by emission due to the energy gained from the absorption. The word scattering might be used if emission is immediately following the previous absorption, and the "scattering" concept might be stretched to include longer time intervals between if doing so does not affect the analysis. Some types of scattering:

Photon scattering:

Note that some photon scattering phenomena follows the pattern of classical (wave) electromagnetic radiation theory, whereas some does not, and is only explained by light's quantum nature.

The term scattering is also used regarding the dynamics of planetary systems, e.g., planets redirected from their orbits. The term may be similarly used for interactions between stars in "crowded" regions such as globular clusters and the centers of galaxies.

(physics,EMR,radiative transfer,photons)
Further reading:

Referenced by pages:
absorption coefficient
Compton scattering
cosmic dust
cross section
distance modulus (μ)
electric dipole radiation
electron scattering
epoch of reionization (EOR)
free streaming
Klein-Nishina formula
light pollution
mean free path
Mie scattering
millimeter astronomy
neutron scattering
optical depth (τ)
Penrose Compton scattering (PCS)
radiative transfer (RT)
Rayleigh scattering
reflection nebula
radiative transfer code (RT code)
equation of radiative transfer (RTE)
synchrotron self-Compton (SSC)
stellar encounter
surface of last scattering
Sachs-Wolfe effect (SWE)
synchrotron radiation
thermal bremsstrahlung
Thomson optical depth (τT)
Thomson scattering
tired light