Patsahan Oksana, Mryglod Ihor, Caillol Jean-Michel
Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine 1, Svientsitskii Street 79011 Lviv, Ukraine.
J Phys Condens Matter. 2005 Jun 29;17(25):L251-6. doi: 10.1088/0953-8984/17/25/L02. Epub 2005 Jun 10.
The correlation functions of an ionic fluid with charge and size asymmetry are studied within the framework of the random phase approximation. The results obtained for the charge-charge correlation function demonstrate that the second-moment Stillinger-Lovett (SL) rule is satisfied away from the gas-liquid critical point (CP) but not, in general, at the CP. However, in the special case of a model without size asymmetry the SL rules are satisfied even at the CP. The expressions for the density-density and charge-density correlation functions valid far from and close to the CP are obtained explicitly.
在随机相位近似框架内研究了具有电荷和尺寸不对称性的离子流体的关联函数。电荷 - 电荷关联函数的结果表明，远离气 - 液临界点（CP）时满足二阶斯蒂林格 - 洛维特（SL）规则，但一般在临界点处不满足。然而，在没有尺寸不对称性的模型的特殊情况下，即使在临界点也满足SL规则。明确得到了远离和接近临界点时有效的密度 - 密度和电荷 - 密度关联函数的表达式。
