The thermal ion-acoustic fluctuation spectrum of a high-density, low-temperature (2 eV, 10¹⁷ cm^-3), collisional plasma was measured in a CO₂-laser scattering experiment. The measured spectra differed substantially from spectra observed in collisionless plasmas. Fluctuations at the ion-acoustic frequency were strongly enhanced and the width of the resonance was significantly narrowed in comparison to the collisionless case. The Bhatnagar-Gross-Krook theory proved most successful in describing the data.
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Mostovych et al. (1984) studied this question.
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