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首页> 外文期刊>The Journal of Chemical Physics >Effective density terms in proper integral equations
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Effective density terms in proper integral equations

机译:适当积分方程中的有效密度项

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Two complementary routes to a new integral equation theory for site-site molecular fluids are presented. First, a simple approximation to a subset of the atomic site bridge functions in the diagrammatically proper integral equation theory is presented. This in turn leads to a form analogous to the reactive fluid theory, in which the normalization of the intramolecular distribution function and the value of the off-diagonal elements in the density matrix of the proper integral equations are the means of propagating the bridge function approximation. Second, a derivation from a topological expansion of a model for the single-site activity followed by a topological reduction and low-order truncation is given. This leads to an approximate numerical value for the new density coefficient. The resulting equations give a substantial improvement over the standard construction as shown with a series of simple diatomic model calculations. (c) 2005 American Institute of Physics.
机译:提出了两条互补的途径,以建立新的现场分子流体积分方程理论。首先,给出了在图解上正确的积分方程理论中原子位点桥函数子集的简单近似。这进而导致形成类似于反应流体理论的形式,其中分子内分布函数的归一化和适当积分方程的密度矩阵中非对角线元素的值是传播桥函数近似的手段。其次,给出了从单站点活动模型的拓扑扩展,然后是拓扑缩减和低阶截断的推导。这导致新密度系数的近似数值。如一系列简单的双原子模型计算所示,所得到的方程式对标准结构进行了重大改进。 (c)2005年美国物理研究所。

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