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A spherical cavity model for quadrupolar dielectrics

机译：Quadrupolar电介质的球形腔模型

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The dielectric properties of a fluid composed of molecules possessing both dipole and quadrupole moments are studied based on a model of the Onsager type (molecule in the centre of a spherical cavity). The dielectric permittivity epsilon and the macroscopic quadrupole polarizability alpha(Q) of the fluid are related to the basic molecular characteristics (molecular dipole, polarizability, quadrupole, quadrupolarizability). The effect of aQ is to increase the reaction field, to bring forth reaction field gradient, to decrease the cavity field, and to bring forth cavity field gradient. The effects from the quadrupole terms are significant in the case of small cavity size in a non-polar liquid. The quadrupoles in the medium are shown to have a small but measurable effect on the dielectric permittivity of several liquids (Ar, Kr, Xe, CH4, N-2, CO2, CS2, C6H6, H2O, CH3OH). The theory is used to calculate the macroscopic quadrupolarizabilities of these fluids as functions of pressure and temperature. The cavity radii are also determined for these liquids, and it is shown that they are functions of density only. This extension of Onsager's theory will be important for non-polar solutions (fuel, crude oil, liquid CO2), especially at increased pressures. (C) 2016 AIP Publishing LLC.
机译：基于onSager型的模型研究了由具有偶极子和四极孔矩的分子组成的流体的介电性质，基于onsager型（球形腔中心中的分子）。流体的介电常介电常数ε和宏观四极偏热性α（Q）与基本分子特征（分子偶极，极化性，四极，四氧化物）有关。 AQ的效果是增加反应场，使反应场梯度降低，以减小腔场，并带来腔场梯度。在非极性液体中的小腔尺寸的情况下，四极其术语的效果显着。培养基中的Quadrupoles对几种液体（Ar，Kr，Xe，CH 4，N-2，CO 2，CS2，C6H6，H 2 O，CH 3 OH）的介电常数具有小但可测量的影响。该理论用于根据压力和温度的功能计算这些流体的宏观四极腙。还确定腔半径的这些液体，并且示出它们仅是密度的函数。 Onsager的理论延伸对于非极性解决方案（燃料，原油，液体CO2）非常重要，尤其是在增加的压力下。 （c）2016 AIP发布LLC。

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