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arXiv 0803.2949cond-mat.stat-mech
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水和其它类似液体模型中的密度振荡

Density oscillations in a model of water and other similar liquids

M. Apostol, E. Preoteasa

摘要:

我们认为液态水的动力学有一个由O^{-2z}(氧)阴离子和H^{+z}(氢)阳离子组成的分量,其中z是一个(小的)约化的有效电子电荷。这种模型也适用于其他类似的液体。导出了含有声波的两组分离子等离子体密度振荡的本征模,并计算了介电函数。等离子体激元可能有助于最近介绍的液体热力学模型中的元激发。结果表明,利用该模型可以了解水中的声异常。结果被推广到一个不对称的离子物种之间的短程相互作用,以及多组分等离子体,和结构因子的计算。

英文摘要:

It is suggested that the dynamics of liquid water has a component consisting of O^{-2z} (oxygen) anions and H^{+z} (hydrogen) cations, where z is a (small) reduced effective electron charge. Such a model may apply to other similar liquids. The eigenmodes of density oscillations are derived for such a two-species ionic plasma, included the sound waves, and the dielectric function is calculated. The plasmons may contribute to the elementary excitations in a model introduced recently for the thermodynamics of liquids. It is shown that the sound anomaly in water can be understood on the basis of this model. The results are generalized to an asymmetric short-range interaction between the ionic species as well as to a multi-component plasma, and the structure factor is calculated.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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