二元离子混合物中的有效势和互扩散
Effective Potential and Interdiffusion in Binary Ionic Mixtures
摘要：
我们计算的互扩散系数在两个组件，弱或强耦合离子等离子体（气体或液体，由两个离子物种浸入到一个中和电子背景）。我们使用Baalrud和Daligaut最近提出的有效势方法[PRL，110，235001，（2013）]。它使我们能够扩展标准的Chapman-Enskog程序计算的互扩散系数的情况下，强库仑耦合。我们计算了几种离子混合物的二元扩散系数，并将其拟合为广义库仑对数的方便表达式。这些拟合涵盖了从弱到强库仑耦合的广泛等离子体参数。它们可以用来模拟离子在普通恒星以及白矮星和中子星中的扩散。
英文摘要：
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 [PRL, 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.
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