The double resonance parametric process in a plasma is experimentally studied by using two high frequency electric fields which have frequencies near the electron plasma frequency. The difference between two frequencies is selected twice the ion acoustic wave frequency. The experimental results are well explained by the theory which predicts the lower threshold and higher growth rate of the parametric excitation for the two pumps than those for the single pump.
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Akiyama et al. (1977) studied this question.
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