Beznogov M V, Yakovlev D G
St. Petersburg Academic University, 8/3 Khlopina Street, St. Petersburg 194021, Russia.
Ioffe Physical Technical Institute, 26 Politekhnicheskaya, St. Petersburg 194021, Russia.
Phys Rev E Stat Nonlin Soft Matter Phys. 2014 Sep;90(3):033102. doi: 10.1103/PhysRevE.90.033102. Epub 2014 Sep 2.
We calculate interdiffusion coefficients in a two-component, weakly or strongly coupled ion plasma (gas or liquid, composed of two ion species immersed into a neutralizing electron background). We use an effective potential method proposed recently by Baalrud and Daligaut [Phys. Rev. Lett. 110, 235001 (2013)]. It allows us to extend the standard Chapman-Enskog procedure of calculating the interdiffusion coefficients to the case of strong Coulomb coupling. We compute binary diffusion coefficients for several ionic mixtures and fit them by convenient expressions in terms of the generalized Coulomb logarithm. These fits cover a wide range of plasma parameters spanning from weak to strong Coulomb couplings. They can be used to simulate diffusion of ions in ordinary stars as well as in white dwarfs and neutron stars.
我们计算了双组分、弱耦合或强耦合离子等离子体（气体或液体，由沉浸在中和电子背景中的两种离子组成）中的互扩散系数。我们使用了Baalrud和Daligaut最近提出的有效势方法[《物理评论快报》110, 235001 (2013)]。这使我们能够将计算互扩散系数的标准Chapman-Enskog程序扩展到强库仑耦合的情况。我们计算了几种离子混合物的二元扩散系数，并用广义库仑对数的方便表达式对其进行拟合。这些拟合涵盖了从弱库仑耦合到强库仑耦合的广泛等离子体参数范围。它们可用于模拟离子在普通恒星以及白矮星和中子星中的扩散。
