The terahertz dynamics of simplest fluids probed by inelastic X-ray scattering

IF 2.5 2区 化学 Q3 CHEMISTRY, PHYSICAL
A. Cunsolo
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引用次数: 10

Abstract

Abstract More than two decades of inelastic X-ray scattering (IXS) studies on noble gases and alkali metals are reviewed to illustrate the advances they prompted in our understanding of the terahertz dynamics of simplest systems. The various literature results outline a remarkably coherent picture of common and distinctive behaviours of liquids and their crystalline counterparts. Furthermore, they draw a consistent and comprehensive picture of the evolution of collective modes at the crossover between the hydrodynamic and the single particle regime, their coupling with fast (sub-ps) relaxation processes and their gradual disappearance upon approaching microscopic scales. The gradual transition of the spectrum towards the single particle limit along with its coupling with collisional relaxations will be discussed in some detail. Finally, less understood emerging topics will be discussed as the occurrence of polyamorphic crossovers, the onset of non-hydrodynamic modes and quantum effects on the spectrum, as well as recent IXS results challenging our vision of the supercritical phase as an intrinsically homogeneous thermodynamic domain.
用非弹性x射线散射探测最简单流体的太赫兹动力学
摘要回顾了近二十多年来稀有气体和碱金属的非弹性x射线散射(IXS)研究,以说明它们在我们对最简单系统的太赫兹动力学的理解方面所取得的进展。各种各样的文献结果勾勒出一个非常连贯的画面,共同的和独特的行为的液体和他们的晶体对应。此外,他们还描绘了在流体力学和单粒子体系交叉时集体模式演变的一致和全面的图景,它们与快速(亚ps)弛豫过程的耦合以及它们在接近微观尺度时逐渐消失。我们将详细讨论谱向单粒子极限的逐渐跃迁及其与碰撞弛豫的耦合。最后,不太为人所知的新兴主题将被讨论,如多晶交叉的发生,非流体动力模式的开始和光谱上的量子效应,以及最近的IXS结果挑战了我们对超临界相作为本质上均匀的热力学领域的看法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
14.20
自引率
1.60%
发文量
5
审稿时长
1 months
期刊介绍: International Reviews in Physical Chemistry publishes review articles describing frontier research areas in physical chemistry. Internationally renowned scientists describe their own research in the wider context of the field. The articles are of interest not only to specialists but also to those wishing to read general and authoritative accounts of recent developments in physical chemistry, chemical physics and theoretical chemistry. The journal appeals to research workers, lecturers and research students alike.
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