Khrapak S A, Ivlev A V, Morfill G E, Thomas H M
Centre for Interdisciplinary Plasma Science, Max-Planck-Institut für Extraterrestrische Physik, D-85740 Garching, Germany.
Phys Rev E Stat Nonlin Soft Matter Phys. 2002 Oct;66(4 Pt 2):046414. doi: 10.1103/PhysRevE.66.046414. Epub 2002 Oct 21.
The problem of calculating the ion drag force in complex plasmas is considered. It is shown that the standard theory of Coulomb scattering usually fails for the ion-dust elastic collisions. A simple approach to extend this theory is proposed. This leads to a considerable enhancement in the ion-dust elastic scattering cross section and, hence, increases the ion drag force in comparison with the previous analytical results. Analysis shows that the ion drag usually exceeds the electrostatic force in the limit of weak electric field. We suggest that this is the cause of the central "void" observed in microgravity complex plasma experiments.
考虑了计算复杂等离子体中离子拖曳力的问题。结果表明，库仑散射的标准理论通常不适用于离子 - 尘埃弹性碰撞。提出了一种扩展该理论的简单方法。这导致离子 - 尘埃弹性散射截面显著增大，因此与先前的分析结果相比，离子拖曳力增大。分析表明，在弱电场极限下，离子拖曳力通常超过静电力。我们认为这是在微重力复杂等离子体实验中观察到中心“空洞”的原因。
