The dispersion relation of electron waves in a non-Maxwellian plasma has been investigated experimentally. It is observed that the dispersion relation of the Landau mode is modified and that a new wave mode with the dispersion relation ω/ k ≃(1/2) V c ( V c : truncated velocity) is observed for frequencies less than the electron Langmuir frequency. Those experimental results are compared with a simple theoretical model.
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Kawai et al. (1975) studied this question.
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