The ionic dynamic structure factor is examined to assess the relative roles of dissipation and the effective ionic interaction. Two disparate physically based models of dissipation, which can differ numerically by orders of magnitude, are used in molecular dynamics. We find a negligible impact on the amplitudes of the dynamic structure factors for physically realistic parameter values. We then examine the effective ionic interaction by varying its strength, the size of the atomic core (through a pseudopotential), and the screening model. We find that “diffusive” peaks in the dynamic structure factor are very sensitive to the form of the ionic interaction, and this sensitivity arises primarily from atomic physics through the pseudopotential. This suggests that it would be useful to employ the measured zero-frequency dynamic structure factor $S_{ii}(k,0)$ as a constraint on the effective interaction, which in turn can be used to compute physical properties.

中文翻译：

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耗散和有效相互作用对致密等离子体动力学结构因子的影响

检查离子动态结构因子以评估耗散和有效离子相互作用的相对作用。分子动力学中使用了两种不同的基于物理的耗散模型，它们在数值上可能存在数量级差异。我们发现对物理现实参数值的动态结构因素的幅度的影响可以忽略不计。然后，我们通过改变其强度、原子核的大小（通过赝势）和筛选模型来检查有效的离子相互作用。我们发现动态结构因子中的“扩散”峰对离子相互作用的形式非常敏感，这种敏感性主要来自原子物理学通过赝势。这表明使用测量的零频率动态结构因子是有用的${秒}_{\mathrm{一世}\mathrm{一世}}(克,0)$ 作为对有效相互作用的约束，而后者又可用于计算物理特性。