太空岩石和优化扫描电子沟道对比度
Space rocks and optimising scanning electron channelling contrast
摘要：
前散射电子成像是一种流行的显微技术，特别是对于配备有电子背散射衍射检测器的扫描电子显微镜。原则上，该方法能够对微观结构进行定性成像，但由于所提供的对比度信息有限，定量评估可能受到限制。在这项工作中，我们探索forescatter电子成像，并证明成像可以优化地形，相位和微妙的方向对比度成像，通过适当的样品和检测器定位。我们证明了成像模式之间的关系，使用系统的变化，在探测器的定位和比较这与伪forescatter电子图像，从图像分析的衍射图案，探索和确认图像对比度模式。我们证明了这些对比机制的地图上获得的样本的基遍陨石。
英文摘要：
Forescatter electron imaging is a popular microscopy technique, especially for scanning electron microscopes equipped with an electron backscatter diffraction detector. In principal, this method enables qualitative imaging of microstructure but quantitative assessment can be limited due to limited information about the contrast afforded. In this work, we explore forescatter electron imaging and demonstrate that imaging can be optimised for topographic, phase, and subtle orientation contrast imaging through appropriate sample and detector positioning. We demonstrate the relationship between imaging modes using systematic variation in detector positioning and compare this with pseudo-forescatter electron images, obtained from image analysis of diffraction patterns, to explore and confirm image contrast modes. We demonstrate these contrast mechanisms on a map obtained from a sample of the Gibeon meteorite.
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