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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Pronounced variation in the collective dynamics of highly correlated lightest liquid alkali metal: Lithium
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Pronounced variation in the collective dynamics of highly correlated lightest liquid alkali metal: Lithium

机译：高度相关的最轻液态碱金属：锂的集体动力学中的明显变化

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摘要

Recently measured inelastic X-ray spectra (IXS) of detailed coherent dynamical structure factor S(κ, ω) and hence the equilibrium collective dynamics, of the lightest liquid alkali metal, lithium at 475 K, have been successfully explained using the modified microscopic theory of the collective dynamics of a simple liquid, in a huge wave-vector, κ, range: 1.4 nm~(-1) ≤ κ ≤ 110.0 nm~(-1), ≤κ is the linear momentum transfer. The role of single particle motion in the collective dynamics of the liquid changes from diffusive for smaller values of wave-vector, κ < 21 nm-1 to that of a free particle for higher κ-values, 21 nm~(-1) ≤ κ ≤ 110 nm~(-1). The quantum correction due to detailed balance condition in S(κ, ω) for liquid Li, whose dynamics, unlike that of quantum liquid ~4He, is essentially classical, yields results in better agreement with the corresponding experimental S(κ, ω) and the quantum correction becomes significant for higher values of κ and ω. The wave-vector dependent variation of longitudinal viscosity, ηl, is in good agreement with the corresponding results obtained from memory function approach. The wave-vector dependent variation of single characteristic relaxation time lies in between the variation of two relaxation times of memory function approach.
机译：使用改进的微观理论已成功地解释了最近测得的详细相干动力学结构因子S（κ，ω）的非弹性X射线光谱（IXS）以及因此最轻的液态碱金属锂在475 K下的平衡集体动力学。简单液体的集体动力学中的一个，在一个巨大的波矢量κ中，范围为1.4 nm〜（-1）≤κ≤110.0 nm〜（-1），≤κ是线性动量传递。单个粒子运动在液体的集体动力学中的作用从较小的波矢量κ<21 nm-1的扩散变为较大的κ值21 nm〜（-1）≤的自由粒子的扩散κ≤110 nm〜（-1）。由于液体Li的S（κ，ω）中的详细平衡条件而导致的量子校正，其动力学与量子液体〜4He的动力学基本不同，其动力学与相应的实验S（κ，ω）更好地吻合对于较大的κ和ω值，量子校正变得很重要。纵向粘度η1随波矢量的变化与从记忆函数方法获得的相应结果非常吻合。单个特征弛豫时间的依赖于波矢量的变化介于记忆函数方法的两个弛豫时间的变化之间。

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