固定左右：用菊池衍射指定手性元素晶体结构
Fixing Left and Right: Assignment of Chiral Elemental Crystal Structures using Kikuchi Diffraction
摘要：
化学元素锰、碲和硒的晶体可以显示出手性的影响。为了检测手性变化对这些元素的样品性质的可能影响，需要在晶体学分析中解决这些元素晶体结构的两种对映异构的、物理上不同的变体的潜在存在。然而，由于晶体中运动学X射线散射的基本限制，单元素晶体中手性的影响很难使用标准X射线衍射技术来感测。在本文中，我们证明了在扫描电子显微镜中的动态菊池衍射对单个化学元素晶体中的局部手性敏感。我们证明手性分配在$β$ -锰，我们确定的意义上的碲和硒的三角结构的菊池衍射图案的晶体手性。
英文摘要：
Crystals of the chemical elements manganese, tellurium, and selenium can show the effects of handedness. In order to sense the possible effects of a changing sense of chirality on the properties of samples from these elements, the potential presence of two, enantiomorphic, physically different, variants of these elemental crystal structures needs to be resolved in crystallographic analyses. Due to fundamental limitations of kinematical X-ray scattering in crystals, however, the effects of chirality in single-element crystals are very difficult to sense using standard X-ray diffraction techniques. In the present paper, we show that dynamical Kikuchi diffraction in the scanning electron microscope is sensitive to the local sense of chirality in crystals of single chemical elements. We demonstrate chirality assignment in $β$-manganese, and we determine the sense of crystal chirality from Kikuchi diffraction patterns of the trigonal structures of tellurium and selenium.
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