摘要:
利用同步辐射光源开展高压X射线衍射(X-ray diffraction,XRD)研究已有近四十年的历史,并且已经取得了非常丰硕的成果.单晶XRD作为高压研究的а部分,在同步辐射装置上的应用也有了接近三十年的历史.近年来,随着同步辐射光学技术以及高压技术、特别是大衍射窗口金刚石对顶砧压腔(diamond anvil cell,DAC)的改进与发展,同步辐射高压单晶衍射实验方法在高压研究中的应用越来越普及.由于能够在压力条件下获得样品在三维空间中的衍射信息分布以及数据具有高信噪比等优势,单晶XRD实验方法不仅可以用于压力条件下的晶体结构解析,如获取晶胞参数、空间群、原子坐标以及原子占位等信息,而且可进а步做晶体电荷密度分析研究,得到更多的化学键、电荷分布及其变化等信息.本文主要介绍同步辐射高压单晶XRD实验方法及相关技术,其中包括单晶XRD实验系统、单晶XRD所用DAC、单晶样品装填以及单晶XRD数据处理等内容.
关键词:
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高压
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单晶
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同步辐射
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X射线衍射
Abstract:
A lot of great work has been done since the high pressure research carried out on synchrotron radiation facility almost 40 years ago. The history of high pressure single-crystal diffraction research on synchrotron radiation facility has also been more than 20 years. Recently, with the development of synchrotron X-ray optical techniques and high pressure technology, especially the invention and improvement of large opening diamond anvil cell (DAC), high pressure single-crystal X-ray diffraction (HPSXRD) method has become more and more popular in high pressure studies. The HPSXRD can be used to perform structure determination and refinement to obtain the information about lattice parameter, space group, atomic coordinate and site occupation. Compared with powder X-ray diffraction, the HPSXRD can not only obtain the three-dimensional diffraction information of samples, but also have much better signal-to-noise ratio. Furthermore, the HPSXRD data can be used to study the electron density distribution to obtain more information about chemical bonds and electron distribution. In this work, we introduce the HPSXRD method in synchrotron radiation facilities, including the knowledge of single-crystal X-ray diffraction experimental system, DAC for HPSXRD, sample loading, and HPSXRD data processing.
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