A frequency upshift of several megahertz is observed in the interaction of a high power microwave (f₀=9 GHz) with an unmagnetized inhomogeneous argon plasma. The dependencies of the frequency upshift on the plasma density, incident microwave power and space have been investigated. The induced frequency upshift is considered to be related to a rapidly expanding plasma created by the ponderomotive force of a strong standing wave.
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Xu et al. (1997) studied this question.
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