4Dスキャニング超高速電子顕微鏡:材料の表面動態の可視化
Omar F Mohammed1, Ding-Shyue Yang, Samir Kumar Pal
1Physical Biology Center for Ultrafast Science and Technology, Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125, USA.
Journal of the American Chemical Society
|May 5, 2011
まとめ
スキャニング超高速電子顕微鏡 (S-UEM) は,材料の表面ダイナミクスを研究するために高時空解像度を達成します. この新しい方法は,超高速の研究のための従来のスキャニング電子顕微鏡 (SEM) の限界を克服します.
科学分野:
- 材料科学 材料科学とは
- 表面科学とは,地表科学である.
- 顕微鏡による顕微鏡検査
背景:
- 従来のスキャニング電子顕微鏡 (SEM) は,限られた時間解像度を持っています.
- 物質表面の超高速ダイナミクスを研究するには,高い時間解像度が必要です.
研究 の 目的:
- 時間解像度の高い研究のために,スキャニング超高速電子顕微鏡 (S-UEM) を開発する.
- 表面ダイナミクスのために,空間と時間の両方で高解像度を達成するために.
主な方法:
- フィールドエミッターの先端から光生成された電子パケットを使用して開発されたS-UEM.
- 空間電荷の反発を最小限に抑え,時間解像度を高めるために,低電子数を利用しました.
- 空間時間的な可視化のためのSEMの空間解像度を維持しました.
主要な成果:
- 半導体および金属材料のダイナミクスを調査するための実証されたS-UEM.
- 超短時間の解像度を達成し,従来の方法よりも数桁の優れている.
- フェムト秒刺激の後の表面動態の可視化が可能になりました.
結論:
- S-UEMは,材料科学にとって前例のない空間時間解像度を提供します.
- この技術は,超高速な表面動態を視覚化することができる.
- 材料科学と生物科学に潜在的応用がある.
関連する概念動画
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
Accelerated...
Fundamental Principles
Accelerated...
Electron Microscope Tomography and Single-particle Reconstruction
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.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
Atomic Force Microscopy
Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
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...
Overview of Electron Microscopy
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.
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...


