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相关概念视频

Overview of Microscopy Techniques01:22

Overview of Microscopy Techniques

The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...
Scanning Electron Microscopy01:07

Scanning Electron Microscopy

A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
Fundamental Principles
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相关实验视频

Updated: Jul 12, 2026

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
11:14

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

Published on: May 28, 2016

由使用扫描道显微镜的缺陷引起的远程电子干扰.

H A Mizes, J S Foster

    Science (New York, N.Y.)
    |May 5, 1989
    PubMed
    概括

    扫描道显微镜观察到石墨上的分子缺陷引起的远程电子扰动. 这些缺陷会产生周期性的电荷密度振荡,揭示出缺陷特性.

    科学领域:

    • 表面科学是一门科学.
    • 凝聚物质物理学 凝聚物质物理学
    • 材料科学是一种材料科学.

    背景情况:

    • 了解表面的电子特性至关重要.
    • 表面上的缺陷可以显著改变电子行为.
    • 扫描道显微镜 (STM) 是用于原子尺度表面分析的强大工具.

    研究的目的:

    • 观测和描述由石墨表面上孤立的分子缺陷引起的远程电子干扰.
    • 为了研究由这些缺陷引起的电荷密度振荡的性质.
    • 为了将振荡的对称性与缺陷特征相关联.

    主要方法:

    • 利用扫描道显微镜 (STM) 进行实时空间成像.
    • 在高度定向的 pyrolytic 石墨 (HOPG) 表面上吸附孤立分子.
    • 分析了由此产生的电子扰动和电荷密度振荡.

    主要成果:

    • 成功地观察到石墨上孤立的吸附分子周围的远程电子扰动.
    • 确定了周期性电荷密度振荡,类似于弗里德尔振荡.
    • 确定振荡波长是√3乘以石墨格子常数.
    • 发现振荡对称性表明了特定的缺陷分子.

    更多相关视频

    All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
    11:33

    All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

    Published on: January 19, 2018

    Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
    07:24

    Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

    Published on: May 10, 2021

    相关实验视频

    Last Updated: Jul 12, 2026

    Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
    11:14

    Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

    Published on: May 28, 2016

    All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
    11:33

    All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

    Published on: January 19, 2018

    Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
    07:24

    Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

    Published on: May 10, 2021

    结论:

    • 孤立的吸附分子作为缺陷,在石墨表面引发显著的远程电子干扰.
    • 观察到的电荷密度振荡为表面缺陷的电子影响提供了直接的电子信号.
    • STM能够解决这些微妙的电子效应,提供一种基于其电子签名的分子缺陷特征的方法.