Plasma oscillations, also known as Langmuir waves (eponymously after Irving Langmuir), are rapid oscillations of the electron density in conductive media, most notably plasmas as well as metals, at frequencies typically corresponding to the ultraviolet band of the electromagnetic spectrum. The oscillations can be described as an instability in the dielectric function of a free electron gas.
Plasma oscillations, also known as Langmuir waves (eponymously after Irving Langmuir), are rapid oscillations of the electron density in conductive media, most notably plasmas as well as metals, at frequencies typically corresponding to the ultraviolet band of the electromagnetic spectrum. The oscillations can be described as an instability in the dielectric function of a free electron gas.
Source: Wikipedia "Plasma oscillation" · CC BY-SA 4.0
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