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Updated: Feb 13, 2026

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对于多通道4D-STEM的漂移纠正方法

Ali Mostaed¹, Chen Huang², Amirafshar Moshtaghpour²

¹The Rosalind Franklin Institute, Didcot, OX11 0QS, UK; Department of Materials, University of Oxford, Oxford, OX1 3PH, UK.

Ultramicroscopy

|February 11, 2026

概括

这项研究引入了多通道4D-STEM电子图像学新型漂移校正方法. 这些技术在对光束敏感材料的低流量成像中增强了对比度和信号噪声比.

科学领域:

电子显微镜的电子显微镜
材料科学是一种材料科学.
图像技术的成像技术.

背景情况:

扫描传输电子显微镜 ((S) TEM) 中相对照成像为光束敏感材料提供近原子分辨率.
在 (S) TEM成像中,低电子流动导致对比度差,信号与噪声比率 (SNR) 低.
多通道数据采集改善了SNR,但由于样本漂移而复杂,特别是在高放大时.

研究的目的:

开发和评估有效的漂移校正方法,用于多通道4D-STEM数据采集在低流量电子图形.
为了应对精细样本的高分辨率成像中样本漂移的挑战.
为了提高在图像学成像中相对比重建的质量.

主要方法:

开发了两种新的方法来计算收购通道之间的漂移向量:一种是使用现实空间中重建的图形相,另一种是使用衍射模式.
在4D-STEM数据采集过程中使用了失焦的探头.
应用于多通数据的漂移校正,以减轻样本移动工件.

主要成果:

证明了开发的两种方法在计算和纠正漂移向量的有效性.
从低SNR数据获得的图形相重建的对比度显著改善.
通过使用失焦探头验证了低流量电子图谱的方法.

结论:

报道的漂移校正方法对于在低流量电子图谱中多通道4D-STEM数据采集是有效的.
这些方法成功地提高了图像对比度和SNR,使光束敏感材料的结构分析更好.
这些发现为使用图解学对生物样品和其他弱散射样品的高分辨率成像开辟了新的可能性.

关键词:

在4D-STEM中,漂移纠正漂移纠正漂移纠正多通道的多通道图形图形 (Ptychography) 是一种图形图形,可以用在图形图形上.

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