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相关概念视频

Overview of Microscopy Techniques01:22

Overview of Microscopy Techniques

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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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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.
Fundamental Principles
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相关实验视频

Updated: Jun 17, 2025

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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高动态范围扫描道显微镜

Ajla Karić1, Carolina A Marques1, Berk Zengin1

  • 1Department of Physics, University of Zurich, Winterthurerstrasse 190, Zurich CH-8057, Switzerland.

MethodsX
|August 6, 2024
PubMed
概括
此摘要是机器生成的。

我们通过积极去除当前波器来增强扫描道显微镜 (STM) 的动态范围. 这种方法可以防止预放大器和,使得高准确度光谱和成像能够在没有硬件修改的情况下进行.

关键词:
活动功率过器 活动功率过器放大器和度的增强器带结构 带结构国家密度的密度.动态范围 动态范围高动态范围扫描道显微镜扫描道显微镜的扫描方法扫描道光谱学 扫描道光谱

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相关实验视频

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Detection and Quantification of Tunneling Nanotubes Using 3D Volume View Images
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科学领域:

  • 物理 物理学 物理
  • 材料科学 材料科学 材料科学
  • 纳米技术 纳米技术

背景情况:

  • 扫描道显微镜 (STM) 对于纳米级成像和光谱学至关重要.
  • 电流-电压特征中的非线性产生电流波.
  • 这些波可以和预放大器,限制STM测量的动态范围,特别是在低阻抗或高增益时.

研究的目的:

  • 增加扫描道显微镜 (STM) 的动态范围.
  • 为了克服由当前波引起的预放大器和问题.
  • 为了在STM中实现高动态范围光谱和成像.

主要方法:

  • 积极减去由非线性产生的主导电流波.
  • 利用激发电压和电流和之间的相位关系进行取消.
  • 在预放大器输入处使用补偿电容以通过位移电流取消波.
  • 使用两个相同步电压源和一个多频锁定放大器.

主要成果:

  • 成功取消占主导地位的电流和.
  • 防止当前预放大器和.
  • 证明 DC 电流的去除没有任何效果,而第一的去除会导致差电导率的可逆转移.
  • 实现了高动态范围光谱和成像.

结论:

  • 开发的方法有效地扩大了STM的动态范围.
  • 活跃波减去是提高STM性能的一种可行的技术.
  • 这种方法需要最小的硬件更改,依赖于同步的电压源和锁定放大.