Nersisyan H B, Toepffer C, Zwicknagel G
Institut für Theoretische Physik II, Erlangen-Nürnberg Universität, Staudtstrasse 7, D-91058 Erlangen, Germany.
Phys Rev E Stat Nonlin Soft Matter Phys. 2005 Sep;72(3 Pt 2):036403. doi: 10.1103/PhysRevE.72.036403. Epub 2005 Sep 9.
The electric microfield distribution at charged particles is studied for two-component electron-ion plasmas using molecular dynamics simulation and theoretical models. The particles are treated within classical statistical mechanics using an electron-ion Coulomb potential regularized at distances less than the de Broglie length to take into account the quantum-diffraction effects. The potential-of-mean-force (PMF) approximation is deduced from a canonical ensemble formulation. The resulting probability density of the electric microfield satisfies exactly the second-moment sum rule without the use of adjustable parameters. The correlation functions between the charged radiator and the plasma ions and electrons are calculated using molecular dynamics simulations and the hypernetted-chain approximation for a two-component plasma. It is shown that the agreement between the theoretical models for the microfield distributions and the simulations is quite good in general.
利用分子动力学模拟和理论模型，研究了双组分电子 - 离子等离子体中带电粒子处的电微场分布。在经典统计力学框架内，使用在小于德布罗意长度的距离处正则化的电子 - 离子库仑势来处理粒子，以考虑量子衍射效应。从正则系综公式推导出平均力势（PMF）近似。所得的电微场概率密度在不使用可调参数的情况下精确满足二阶矩和规则。使用分子动力学模拟和双组分等离子体的超网链近似，计算了带电辐射体与等离子体离子和电子之间的关联函数。结果表明，微场分布的理论模型与模拟之间的一致性总体上相当好。
