Low frequency structural dynamics of warm dense matter
Low frequency structural dynamics of warm dense matter
复制标题
热致密物质的低频结构动力学
DOI：
10.1063/1.3100203
复制
发表时间：
2009
影响因子：
2.2
通讯作者：
D. Gericke
中科院分区：
文献类型：
--
作者：
G. Gregori;D. Gericke
温暖的致密物质的微观响应的测量已被证明由多千电子伏的非弹性X射线散射使用基于激光的源。这些技术已被用来研究低到中Z等离子体中的高频电子关联（等离子体）。第四代光源的出现将提供高通量的窄带和相干x射线，这将允许观察低频相关性（离子声波）。在本文中，我们提出了一个分析的低频模式，通过计算频率依赖的离子-离子结构因子。我们的模型包括所有相关的多体贡献所产生的强耦合和非理想等离子体效应。特别地，离子-离子结构因子通过满足有限数量的求和规则在记忆函数形式主义内获得。这项工作可以作为一个基础，以直接的稠密等离子体模型的实验测试，尽快keV的自由电子激光源将成为可用。
Measurements of the microscopic response of warm dense matter have been demonstrated by multi-keV inelastic x-ray scattering using laser-based sources. These techniques have been used to study the high frequency electron correlations (plasmons) in low to mid-Z plasmas. The advent of fourth generation light sources will provide high fluxes of narrowband and coherent x rays that will allow to look at the low frequency correlations (the ion-acoustic waves). In this paper we present an analysis of such low frequency modes by calculating the frequency dependent ion-ion structure factor. Our model includes all the relevant multibody contributions arising from strong coupling and nonideal plasma effects. In particular, the ion-ion structure factor is obtained within the memory function formalism by satisfying a finite number of sum rules. This work could be used as a basis to a direct experimental test of dense plasma model as soon as keV free electron laser sources will become available.
影响因子：
8.6
作者：
Glenzer, S. H.;Landen, O. L.;Redmer, R.
通讯作者：
Redmer, R.