Structural and collisional relaxations in liquids and supercritical fluids.
Structural and collisional relaxations in liquids and supercritical fluids.
复制标题
液体和超临界流体中的结构和碰撞弛豫。
DOI：
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发表时间：
2007
影响因子：
8.6
通讯作者：
A. Vispa
中科院分区：
文献类型：
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作者：
F. Bencivenga;A. Cunsolo;M. Krisch;G. Monaco;L. Orsingher;G. Ruocco;F. Sette;A. Vispa
在2-14 nm（-1）动量转移范围内，用高分辨率非弹性X射线散射测定了缔合流体（水和氨）和简单流体（氮和氖）的动态结构因子S（Q，Ω）。采用广义流体力学模型的线形分析方法研究了弛豫过程，并对其强度和时间尺度进行了表征。我们观察到，在液相中，这样的过程是由分子间键的重排，而在超临界区域，它假定碰撞的性质。
The dynamic structure factor S(Q,omega) of both associated (water and ammonia) and simple fluids (nitrogen and neon) has been determined by high-resolution inelastic x-ray scattering in the 2-14 nm(-1) momentum transfer range. A line-shape analysis with a generalized hydrodynamic model was used to study the involved relaxation process and to characterize its strength and time scale. We observe that in the liquid phase such a process is governed by rearrangements of intermolecular bonds, whereas in the supercritical region it assumes a collisional nature.