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Transmission Electron Microscopy01:15

Transmission Electron Microscopy

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 keV in...

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Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
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基于光二极管的超快电子显微镜的零时测定.

S T Kempers1, S Borrelli1, E R Kieft2

  • 1Eindhoven University of Technology, Coherence and Quantum Technology, 5600 MB Eindhoven, the Netherlands.

Structural dynamics (Melville, N.Y.)
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概括
此摘要是机器生成的。

我们开发了一种简单的光二极管方法,以超快电子显微镜精确测量零时. 这种技术确保了电子和激光脉冲在探头实验中的准确时间重叠.

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科学领域:

  • 超快电子显微镜的超快电子显微镜
  • 五秒激光物理 五秒激光物理
  • 材料科学是一种材料科学.

背景情况:

  • 在超快电子显微镜 (UEM) 中的探头实验需要在激发 () 和探头 (探头) 脉冲之间精确的时间重叠.
  • 准确确定零时 (t0) 对于解决材料中的超快动态至关重要.
  • 现有的t0确定方法可能是复杂的或昂贵的.

研究的目的:

  • 提出一种基于光二极管的成本效益高,用户友好的方法,用于在UEM中测量零时.
  • 为了使单电子脉冲与秒激光脉冲的精确时间对齐.
  • 为实现微米和皮秒时空分辨率奠定基础.

主要方法:

  • 在UEM的样本持有器中集成的光电极的开发.
  • 使用光二极管检测电子和激光脉冲之间的时间重叠.
  • 开发的对齐方法的时间分辨率的表征.

主要成果:

  • 一个基于光二极管的对齐装置成功地实现了零时测量.
  • 最初的设备实现了24皮秒 (ps) 的时间分辨率.
  • 光二极管的设计被确定为时间分辨率的限制因素.

结论:

  • 光二极管方法提供了一种实用的方法,用于在UEM中实现时间零对齐.
  • 未来使用容量较低的光二极管的改进将提高时间和空间分辨率.
  • 这种技术为UEM的先进时空调查铺平了道路.