ALPHABETA: a dedicated open‐source tool for calculating TEM stage tilt angles
ALPHABETA: a dedicated open‐source tool for calculating TEM stage tilt angles
复制标题
DOI：
10.1111/jmi.12774
复制
发表时间：
2018-12
影响因子：
2
通讯作者：
N. Cautaerts;R. Delville;D. Schryvers
中科院分区：
文献类型：
--
作者：
N. Cautaerts;R. Delville;D. Schryvers
这项工作描述了开源软件ALPHABETA的概念、数学框架和实现，该软件是一种用于计算任何TEM双倾斜平台上的α和β倾斜角的专用工具。ALPHABETA提供了一个直观的用户界面，用于校准感兴趣区域的方向，并随后计算到达区域轴的角度倾斜，围绕给定反射执行旋转，或设置2束或弱束条件。样品在载物台上的取向和倾斜范围可达域可以在赤平投影图中可视化。评估了该方法获得一组区域轴的精度，并给出了一些实例研究。该工具可以在图像模式下进行大幅度倾斜，并在软件中预先指示可到达的区域，从而大大缩短了倾斜工作的时间。除了便于倾斜到不同的区域轴，该软件可用于杂项应用，如制作暗场倾斜系列，而无需专门的硬件。
This work describes the concepts, the mathematical framework and the implementation of the open source ALPHABETA software, a dedicated tool for calculating α and β tilt angles on any TEM double tilt stage. ALPHABETA provides an intuitive user interface to calibrate the orientation of the region of interest and to subsequently calculate the angle tilts to reach a zone axis, to perform a rotation around a given reflection, or to set up a 2‐beam or weak beam condition. The orientation of the sample on the stage and the tilt range reachable domain can be visualised in a stereographic projection plot. The accuracy of the method to reach a set of zone axis was evaluated and some case studies are presented. The tool significantly reduces time for tilting work as major tilts can be performed in image mode and reachable zones are beforehand indicated in the software. Besides facilitating the tilting to different zone axes, the software can be used for miscellaneous applications such as making dark field tilt series without specialised hardware.