Gatti Marco, Kortshagen Uwe
Department of Mechanical Engineering, University of Minnesota, 111 Church St. SE, Minneapolis, Minnesota 55455, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2008 Oct;78(4 Pt 2):046402. doi: 10.1103/PhysRevE.78.046402. Epub 2008 Oct 20.
An accurate prediction of the particle charge in plasmas is of fundamental importance for a wide range of problems from the study of dusty or complex plasmas to the controlled synthesis of nanoparticle materials in plasmas. Despite its known deficiencies, the orbital motion limited (OML) theory, which strictly applies only to collisionless plasmas, is the most widely used model to describe particle charging. This paper develops a simple, analytical model to describe the charging of particles in plasmas over a wide range of pressures and particle sizes. In spite of its simplicity, excellent agreement is found with results of a self-consistent molecular dynamics Monte Carlo model and with experimental results found in the literature. In particular, the model presented here provides significant improvements compared to the OML theory.
准确预测等离子体中的粒子电荷对于从尘埃或复杂等离子体研究到等离子体中纳米颗粒材料的可控合成等广泛问题至关重要。尽管其存在已知缺陷，但严格仅适用于无碰撞等离子体的轨道运动受限（OML）理论是描述粒子充电最广泛使用的模型。本文开发了一个简单的解析模型，用于描述在广泛的压力和粒子尺寸范围内等离子体中粒子的充电情况。尽管该模型简单，但与自洽分子动力学蒙特卡罗模型的结果以及文献中的实验结果发现具有极好的一致性。特别是，与OML理论相比，这里提出的模型有显著改进。
