Non-invasive determination of the parameters of strongly coupled 2D Yukawa liquids

Ott, T.; Stanley, M.; Bonitz, M.
June 2011
Physics of Plasmas;Jun2011, Vol. 18 Issue 6, p063701
Academic Journal
We derive a method for identifying the Yukawa model parameters of two-dimensional (2D) strongly coupled dusty plasmas. The method is based on non-invasive observation of the dust component of the plasma and comparison with a large body of simulation data in the form of simple analytical formulas. This approach requires only input from a time-series of configuration snapshots and particle velocities with no recourse to additional information about the system. In addition, we derive an effective coupling parameter for 2D Yukawa systems based on the height of the first maximum of the pair distribution function. Two variants-one valid in the high-coupling range, the other for arbitrary couplings of the liquid-are derived. Comparison to previous approaches to Yukawa coupling parameters shows that the present concept is more general and more accurate. Our results should be directly applicable as a simple, yet reliable diagnostic method for a variety of experiments, including dusty plasmas, colloidal suspensions, and ions in traps, and can be employed to facilitate comparisons between experiments, theory, and simulations.


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