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The Free Volume Dynamics

机译:自由体积动力学

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摘要

In the present contribution the dynamics of the intermolecular free volume is investigated. For this purpose a new computational algorithm has been proposed and programmed. The free volume is analyzed along the atomistic trajectory obtained by molecular dynamics simulations and a picture on time averaged free volume structure is obtained. The picture showed two distinct regimes of the free volume dynamics at pico-second and nano-second time-scale in liquid. The analysis has shown that at the time scale of the ortho-positronium lifetime and in the liquid phase the free volume microstructure ceases to exist in rigid cavities. This picture is consistent with the common considerations on the o-Ps existence, which suppose the o-Ps atom digging its own holes/cavities in liquids around the temperature of the o-Ps lifetime saturates.
机译:在本论文中,研究了分子间自由体积的动力学。为此,已经提出并编程了一种新的计算算法。沿着通过分子动力学模拟获得的原子轨迹分析自由体积,并获得时间平均自由体积结构的图片。图片显示了皮秒和纳秒级液体中的自由体积动力学的两种截然不同的状态。分析表明,在正电子寿命的时间尺度上和在液相中,自由体积的微观结构不再存在于刚性腔中。这张图片与关于o-Ps存在的普遍考虑是一致的,后者假设o-Ps原子在o-Ps寿命温度附近在液体中挖出自己的孔/腔。

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