Momentum transfer resolved electron correlation microscopy

IF 2.1 3区工程技术 Q2 MICROSCOPY

Ultramicroscopy Pub Date : 2023-11-11 DOI:10.1016/j.ultramic.2023.113886

Shuoyuan Huang, Paul M Voyles

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引用次数: 0

Abstract

Electron correlation microscopy (ECM) characterizes local structural relaxation dynamics in fluctuating systems like supercooled liquids with nanometer spatial resolution. We have developed a new type of ECM technique that provides moderate resolution in momentum transfer or k space using five-dimensional scanning transmission electron microscopy. k-resolved ECM on a Pt_57.5Cu_14.7Ni_5.₃P_22.5 metallic supercooled liquids measures rich spatial and momentum structure in the relaxation time data $τ (r, k)$ . Relaxation time maps $τ (r)$ at each azimuthal k are independent samples of the material's underlying relaxation time distribution, and $τ$ of radial k shows more complex behavior than the de Gennes narrowing observed in analogous X-ray experiments. We have determined the requirements for electron counts per k-pixel, number of k-pixels per speckle, and time sampling to obtain reliable k-resolved ECM data.

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动量转移分辨电子相关显微镜

电子相关显微镜(ECM)以纳米空间分辨率表征了过冷液体等波动系统的局部结构弛豫动力学。我们开发了一种新型的ECM技术，该技术使用五维扫描透射电子显微镜在动量传递或k空间中提供中等分辨率。在Pt57.5Cu14.7Ni5.2P22.5金属过冷液体上的k分辨ECM测量了弛豫时间数据τ(r,k)中丰富的空间和动量结构。每个角k处的弛豫时间图τ(r)是材料潜在弛豫时间分布的独立样本，径向k的τ表现出比类似x射线实验中观察到的de Gennes缩窄更复杂的行为。我们已经确定了每k像素电子计数的要求，每个散斑的k像素数，以及采样时间，以获得可靠的k分辨率ECM数据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ultramicroscopy 工程技术-显微镜技术

CiteScore

4.60

自引率

13.60%

发文量

117

审稿时长

5.3 months

期刊介绍： Ultramicroscopy is an established journal that provides a forum for the publication of original research papers, invited reviews and rapid communications. The scope of Ultramicroscopy is to describe advances in instrumentation, methods and theory related to all modes of microscopical imaging, diffraction and spectroscopy in the life and physical sciences.