Plasma recombination

Plasma recombination occurs when free electrons bind with positive ions, reducing the number of charged particles. It can form neutral atoms or molecules and release energy as radiation or particle motion.

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Radiative recombination: An electron binds to an ion and emits the excess energy as a photon. This pathway removes free electrons while carrying recombination energy out as light.
Plasma: A state of matter containing mobile charged particles that collectively respond to electromagnetic fields. Recombination is one process that changes a plasma's charged-particle population.
H II region: A cloud of ionized hydrogen surrounding hot stars that emit ultraviolet radiation. Hydrogen recombination produces characteristic emission used to study these nebulae.
Afterglow: The period after external energy input stops, during which a plasma's properties evolve as it cools and decays. Recombination helps determine how quickly charged particles disappear after a discharge ends.
Three-body recombination: An electron and ion recombine while a second electron carries away excess energy and momentum. This pathway becomes effective in dense plasmas where a third particle can absorb energy.
Electron: A negatively charged elementary particle found in atoms and free in plasmas. Free electrons are captured during plasma recombination.
Recombination line: A spectral line emitted when a free electron is captured by an ion or changes between bound states after capture. Its intensity can reveal recombination rates and conditions in an emitting plasma.
Ambipolar diffusion: Coupled diffusion of electrons and ions that preserves approximate charge neutrality in a plasma. Particle transport can compete with recombination in setting plasma-density decay.
Dissociative recombination: A molecular ion captures an electron and breaks apart into neutral fragments. It is a major recombination route in many molecular and planetary plasmas.
Ion: An atom or molecule with a net electric charge because it has lost or gained electrons. Positive ions provide the charged partners that capture electrons.