Parametric excitation [wherein a Langmuir oscillation at (ω k) simultaneously drives an ion-acoustic mode at (ω′, k′), one sideband Langmuir oscillation at (ω − ω′, k − k′), and possibly another at (ω + ω′, k + k′(] is considered. Steady-state solutions are found for these systems in various limits, taking into account contributions which are third order and higher in the mode fields. Connections with experiment are discussed.
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Robert C. Goldman (1969) studied this question.
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