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Contribution of electron precession to the identification of the space group from microdiffraction patterns

机译：电子进动对微衍射图谱识别空间群的贡献

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摘要

In a previous study, it was reported that the possible space groups of a crystal can be identified at a microscopic or nanoscopic scale, thanks to microdiffraction patterns obtained with a nearly parallel electron incident beam focused on a very small area of the specimen. A systematic method was proposed, which consists of the observation of a few microdiffraction patterns displaying at least two Laue zones. These microdiffraction patterns can also be obtained by using an electron precession equipment. In this case, the patterns display a very large number of reflections in the Laue zones whose intensity is the integrated intensity. These original features greatly facilitate the space group identification method and are particularly useful when the high-order Laue zones (HOLZ) are not visible on microdiffraction patterns or when very thin specimens are not available.
机译：在先前的研究中，据报道，由于用几乎平行的电子入射束聚焦在很小面积的样品上而获得的微衍射图案，可以在微观或纳米尺度上识别出晶体的可能空间群。提出了一种系统的方法，该方法包括观察显示至少两个劳厄区的一些微衍射图样。这些微衍射图样也可以通过使用电子进动设备获得。在这种情况下，图案在强度为积分强度的劳厄区显示大量反射。这些原始特征极大地促进了空间群的识别方法，当在微衍射图案上看不到高阶Laue区域（HOLZ）或无法获得非常薄的样本时，这些功能特别有用。

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