Dispersion of Plasma Dust Acoustic Waves in the Strong-Coupling Regime
- 7 October 1996
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 77 (15) , 3137-3140
- https://doi.org/10.1103/physrevlett.77.3137
Abstract
Low-frequency compressional waves were observed in a suspension of strongly coupled spheres in an rf Kr plasma. Both parts of the complex wave number were measured to determine the dispersion relation, which agreed with a theoretical model of damped dust acoustic waves, ignoring strong coupling, but not with a strongly coupled dust-lattice wave model. The results yield experimental values for the dust plasma frequency, charge, Debye length, and damping rate, and support the applicability of fluid-based dispersion relations to strongly coupled dusty plasmas, which has been a controversy.
Keywords
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