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相关概念视频

Overview of Electron Microscopy01:25

Overview of Electron Microscopy

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The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can only magnify 1000X, and a few can magnify up to 1500X. Electrons, like electromagnetic radiation, can behave like waves, but with wavelengths of 0.005 nm, they produce significantly greater resolution up to 0.05 nm as compared to 500 nm for visible light. An electron microscope (EM) can create a sharp image that is magnified up to 2,000,000X.
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Scanning Electron Microscopy01:07

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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.
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Transmission Electron Microscopy01:15

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In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
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Electron Microscope Tomography and Single-particle Reconstruction01:07

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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
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Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
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Overview of Microscopy Techniques01:22

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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...
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相关实验视频

Updated: Jan 7, 2026

Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
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价值电子光谱使用软X射线发射光谱电子显微镜电子显微镜.

Masami Terauchi1,2,3

  • 1Tohoku Center of Excellence for Microscopy (TCEM), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi, 980-8577, Japan.

Microscopy (Oxford, England)
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PubMed
概括

软X射线发射光谱学 (SXES) 现在适用于扫描电子显微镜,用于分析散装材料. 这种技术通过检查状态的价值带密度和核心水平的变化来映射化学键.

关键词:
价值电子光谱学 价值电子光谱学电子显微镜的电子显微镜软X射线辐射发射是一种柔软的X射线辐射.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 频谱学是一种光谱学.
  • 固态物理 固态物理

背景情况:

  • 软X射线发射光谱 (SXES) 已经适应扫描电子显微镜和电子探针微分析.
  • 这一进步增强了SXES的实际应用,用于研究散装材料中的化学结合状态.

研究的目的:

  • 解释Al-L,B-K和Si-L发射光谱的强度概况.
  • 为了证明SXES如何使用状态的价值带密度 (VB DOS) 和电子束扫描绘制散装材料中的化学键.
  • 介绍在过渡金属中获得介电信息和3D电子计数的方法,以及半导体中的带隙信息.

主要方法:

  • 在扫描电子显微镜和电子探针微分析仪上使用软X射线发射光谱学 (SXES).
  • 分析辐射光谱 (Al-L,B-K,Si-L) 来确定状态的价值带密度 (VB DOS).
  • 使用电子束扫描和控制自我吸收效应来获得化学键图,过渡金属电子结构和半导体带隙信息.

主要成果:

  • 解释了Al-L,B-K和Si-L光谱的强度概况,反映了VB DOS.
  • 与电子束扫描相结合的SXES使散装材料的化学键映射成为可能.
  • 三维过渡金属的L辐射光谱提供了DOS+CS,介电和电子计数信息.
  • 在电子束激发的SXES中,自我吸收效应允许在Si和钻石等半导体中进行L-吸收配置文件和带间隙 (CB) 信息检索.

结论:

  • SXES是一个多功能工具,用于在散装材料中进行详细的化学结合分析.
  • 该技术提供了对电子结构,介电性质和频段间隙的洞察.
  • 通过SXES仪器仪表和方法学的进步,材料表征的进一步应用是可能的.