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从第一个时刻开始计算原子数的方法STEM图像:方法和可能性

Yansong Hao¹, Annick De Backer¹, Scott David Findlay²

¹Electron Microscopy for Materials Science (EMAT), University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium; NANOlight Center of Excellence, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium.

Ultramicroscopy

|November 10, 2024

概括

我们开发了一种新的原子计数方法,使用了第一瞬间扫描传输电子显微镜 (STEM) 图像. 这种技术提供了比传统方法更精确的原子计数,即使有噪音数据.

科学领域:

材料科学材料科学材料科学
分析化学分析化学
物理物理学物理

背景情况:

精确的原子计数对于理解材料特性至关重要.
像HAADF STEM这样的传统方法在精度上有局限性,特别是在杂的条件下.

研究的目的:

开发和验证基于统计模型的量化方法,用于原子分辨率的第一瞬间STEM图像.
通过量化每个原子列的预测潜力来实现精确的原子计数.

主要方法:

使用均加权最小平方估计器来确定图像结构参数.
来自单个原子列的孤立贡献,以量化预测潜力.
在噪音条件下,与传统的HAADF STEM进行了原子计数性能比较.

主要成果:

实现了对每个原子列的预测潜力的量化,从而实现了原子计数.
与HAADF STEM相比,STEM从第一时刻就在原子计数方面表现出更高的精度.
验证了使用大量晶体模拟作为各种样品形状的参考库的稳定性.

结论:

开发的方法在原子计数精度方面取得了显著的进步.
第一时刻的STEM成像对于材料中精确的原子计数是有利的.
参考库方法允许在各种样本几何形状上进行可靠的原子计数.

关键词:

4D STEM 是一个 4D 的 STEM.原子分辨率扫描传输电子显微镜扫描电子显微镜.第一个时刻的STEM.基于模型的配件定量电子显微镜的使用方法统计参数估计理论统计参数估计理论

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