Erlangen 2018 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 27: Complex Plasmas and Dusty Plasmas II
P 27.1: Fachvortrag
Donnerstag, 8. März 2018, 14:00–14:25, KI 1.174
Self-diffusion in single-component Yukawa fluids — •Sergey Khrapak1,2, Boris Klumov1,3, and Lenaic Couedel1 — 1Aix Marseille University, CNRS, Laboratoire PIIM, Marseille, France — 2Institut fuer Materialphysik im Weltraum, Deutsches Zentrum fuer Luft- und Raumfahrt (DLR), Wessling, Germany — 3Joint Institute for High Temperatures, Russian Academy of Sciences, Moscow, Russia
It was suggested in the literature that the self-diffusion coefficient of simple dense fluids can be approximated as a ratio of the squared thermal velocity of the atoms to the ``fluid Einstein frequency.'' We have tested this suggestion using a single-component Yukawa fluid as a reference system. Yukawa fluid is particularly suitable for such a test, because the Einstein frequency is trivially related to the important thermodynamics property, excess internal energy, relatively well known in a wide parameter regime. The available simulation data on self-diffusion in Yukawa fluids, complemented with new data for Yukawa melts, are carefully analyzed. It is shown that although not exact, this earlier suggestion nevertheless provides a very sensible way of normalization of the self-diffusion constant. Additionally, we demonstrate that certain quantitative properties of self-diffusion in Yukawa melts are also shared by systems like one-component plasma and liquid metals at freezing. The observations are briefly discussed in the context of the theory of momentum transfer in complex (dusty) plasmas.