Astronomy   View all facts   Glossary   Help
physical phenomena > event > atomic process > collision
Next atomic processfree-free transition    Upatomic process    Previous atomic processbound-free transition   

collision comparison table
Subject changes property see also is a kind of has definition
Coulomb collision  collisionThe collision between two charged particles.
elastic collision  collisionParticle reactions in which the same particles emerge from the reaction as entered it (e.g. π- p → π- p). In inelastic scattering, where different and/or new particles emerge, energy is used to create new particles.
inelastic collision  collisionA reaction involving a change in the kinetic energy of the system, as in ionization, excitation, or capture; or a process which changes the energy level of the system.
scatteringdirection radiation direction modificationThe process whereby light is absorbed and reemitted in all directions, with essentially no change in frequency. Scattering by free electrons was the dominant source of opacity in the early universe.
spin-flip collision 21-cm radiationcollisionCollision between particles in which the direction of the spin angular momentum changes. Since the total angular momentum is conserved, the orbital angular momentum must be changed in magnitude or direction or both.

Next atomic processfree-free transition    Upatomic process    Previous atomic processbound-free transition