Analytical model of particle charging in plasmas over a wide range of collisionality
Analytical model of particle charging in plasmas over a wide range of collisionality
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DOI：
10.1103/physreve.78.046402
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发表时间：
2008-10-01
影响因子：
2.4
通讯作者：
Kortshagen, Uwe
中科院分区：
文献类型：
--
作者：
Gatti, Marco;Kortshagen, Uwe
等离子体中粒子电荷的准确预测对于从尘埃或复杂等离子体的研究到等离子体中纳米粒子材料的受控合成等广泛的问题具有根本的重要性。尽管有已知的缺陷，轨道运动限制（OML）理论，严格适用于无碰撞等离子体，是最广泛使用的模型来描述粒子充电。本文提出了一个简单的分析模型来描述在宽范围的压力和颗粒尺寸的等离子体中的颗粒充电。尽管它的简单性，良好的协议被发现与自洽的分子动力学蒙特卡罗模型的结果和文献中发现的实验结果。特别是，这里提出的模型提供了显着的改进相比，OML理论。
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.