X-ray coherent scattering in metal physics
X-ray coherent scattering in metal physics
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DOI：
10.1016/j.crhy.2011.11.009
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发表时间：
2012-04-01
影响因子：
1.4
通讯作者：
Sutton, Mark
中科院分区：
文献类型：
--
作者：
Livet, Frederic;Sutton, Mark
在相干x射线散射实验中，观察到衍射波在样品上的干涉。这在观察到的散射强度中给出了一个斑点图案，而标准实验导致漫射强度或布拉格峰的展宽。斑点对应于辐照体积的无序结构，其动力学提供了样品微观结构随时间演变的微观信息。简要介绍了在x射线实验中用于观察散斑的技术，并给出了一些测量时间动力学的例子。这些问题涉及未混合或排序合金的可逆波动和不可逆分解。介绍了一些缺陷成像的实验，并简要讨论了自由电子激光所开启的研究。(C) 2011年中国科学院。Elsevier Masson SAS出版。版权所有。
In a coherent x-ray scattering experiment, interference of the waves diffracted across the sample is observed. This gives a speckle pattern in the observed scattering intensity, whereas a standard experiment leads to diffuse intensity or to broadening of a Bragg peak. Speckles correspond to the disorder configuration of the irradiated volume and their dynamics provide microscopic information of the time evolution of the sample microstructure.After a brief description of the techniques used for the observation of speckles in an x-ray experiment, some examples of measured time dynamics are given. These concern reversible fluctuations and irreversible decomposition of unmixing or ordering alloys. A few experiments in defect imaging are described and the studies opened by free electron lasers are briefly discussed. (C) 2011 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.