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arXiv 1202.4262cond-mat.soft
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类Lennard-Jones双Yukawa模型的平均球近似:与Monte Carlo数据的比较

Mean spherical approximation for the Lennard-Jones-like two Yukawa model: Comparison against Monte Carlo data

J. Krejcí, I. Nezbeda, R. Melnyk, A. Trokhymchuk

摘要:

通过对Lennard-Jones型双Yukawa(LJ 2 Y)势的蒙特卡罗模拟研究,揭示了该模型流体的性质如何依赖于硬核排斥对软排斥的替代.不同的距离定位的硬核已被探索。我们已经发现,对于Lennard-Jones流体的临界点温度稍低和稍高的温度,将硬核放置在比零势能短的距离处是很好地证明了热力学性质实际上与没有硬核的原始LJ 2 Y模型相同。然而,在高温的极端条件下,应该小心,因为硬核的存在会引起系统性能的变化。当用平均球近似(MSA)理论处理类Lennard-Jones流体时,后者是非常重要的。

英文摘要:

Monte Carlo simulation studies are performed for the Lennard-Jones like two Yukawa (LJ2Y) potential to show how properties of this model fluid depend on the replacement of the soft repulsion by the hard-core repulsion. Different distances for the positioning of hard core have been explored. We have found, that for temperatures that are slightly lower and slightly higher of the critical point temperature for the Lennard-Jones fluid, placing the hard core at distances that are shorter than zero-potential energy is well justified by thermodynamic properties that are practically the same as in original LJ2Y model without hard core. However, going to extreme conditions with the high temperature one should be careful since presence of the hard core provokes changes in the properties of the system. The later is extremely important when the mean spherical approximation (MSA) theory is applied to treat the Lennard-Jones-like fluid.

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