Wünsch K, Hilse P, Schlanges M, Gericke D O
Centre for Fusion, Space and Astrophysics, Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom.
Phys Rev E Stat Nonlin Soft Matter Phys. 2008 May;77(5 Pt 2):056404. doi: 10.1103/PhysRevE.77.056404. Epub 2008 May 12.
We investigate the short-range structure in strongly coupled fluidlike plasmas using the hypernetted chain approach generalized to multicomponent systems. Good agreement with numerical simulations validates this method for the parameters considered. We found a strong mutual impact on the spatial arrangement for systems with multiple ion species which is most clearly pronounced in the static structure factor. Quantum pseudopotentials were used to mimic diffraction and exchange effects in dense electron-ion systems. We demonstrate that the different kinds of pseudopotentials proposed lead to large differences in both the pair distributions and structure factors. Large discrepancies were also found in the predicted ion feature of the x-ray scattering signal, illustrating the need for comparison with full quantum calculations or experimental verification.
我们使用推广到多组分系统的超网链方法研究强耦合类流体等离子体中的短程结构。与数值模拟的良好一致性验证了该方法在所考虑参数方面的有效性。我们发现，对于具有多种离子种类的系统，其空间排列存在强烈的相互影响，这在静态结构因子中表现得最为明显。量子赝势被用于模拟致密电子 - 离子系统中的衍射和交换效应。我们证明，所提出的不同类型的赝势会导致对分布和结构因子都有很大差异。在预测的X射线散射信号的离子特征方面也发现了很大差异，这表明需要与全量子计算进行比较或进行实验验证。
