Abstract
We examine experimentally the propagation of an ion wave under the action of a high frequency electric field with frequency close to the electron plasma frequency and an interaction between them. The interaction is characterized by the ponderomotive force. It is proportional to the gradient of a time-averaged high frequency electric field modulated by an ion wave. Experiment confirms that the modulation of a high frequency field increases linearly with the amplitude of the ion wave and with that of the high frequency field. The phase of the modulated wave with respect to the ion wave depends on a frequency of the applied field. Under the action of the ponderomotive force, the phase velocity of ion wave decreases as an injected high frequency power increases in the case where the frequency of the field is lower than the electron plasma frequency.
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