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X-ray Crystallography02:18

X-ray Crystallography

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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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Scanning Electron Microscopy01:07

Scanning Electron Microscopy

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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
Accelerated...
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Electron Microscope Tomography and Single-particle Reconstruction01:07

Electron Microscope Tomography and Single-particle Reconstruction

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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.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
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X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
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The de Broglie Wavelength02:32

The de Broglie Wavelength

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In the macroscopic world, objects that are large enough to be seen by the naked eye follow the rules of classical physics. A billiard ball moving on a table will behave like a particle; it will continue traveling in a straight line unless it collides with another ball, or it is acted on by some other force, such as friction. The ball has a well-defined position and velocity or well-defined momentum, p = mv, which is defined by mass m and velocity v at any given moment. This is the typical...
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関連する実験動画

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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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サブアングストロム収束ビーム電子微分から得られたバレンスの電子分布

Guomin Zhu1, Ece Genc2, Arda Genc1

  • 1Materials Department, University of California, Santa Barbara, California 93106-5050, United States.

Nano letters
|August 29, 2025
PubMed
まとめ

現代の電子顕微鏡技術により,四次元スキャニング伝送電子顕微鏡 (4D STEM) が原子の詳細を明らかにできます. この研究は4DSTEMが 電子の分布と物質内の原子のシフトを 精密にマッピングできることを示しています

キーワード:
四次元スキャニング伝送電子顕微鏡電子 difraktion 電子 difraktion 電子 difraktion についてナノスケールの特徴ストロンチウムチタネート

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科学分野:

  • 材料科学
  • 凝縮物質物理学
  • 電子顕微鏡

背景:

  • 偏差修正スキャニング伝送電子顕微鏡 (STEM) は,収束束電子 difraktion (CBED) パターンを記録することによって,四次元データセット (4D STEM) を生成します.
  • この高度な技術は 精密に位置づけられた 電子探査機を使います

研究 の 目的:

  • 4D STEM CBED パターンは,個々の原子列のサイト対称性,原子位移り,およびバレンスの電子分布を検知することができることを示します.
  • 実験的な4D STEM CBEDパターンを理論的な計算と相関させ,正確な材料の特徴づけを行う.

主な方法:

  • ストロンチウムチタナート (SrTiO3) の単一結晶から4DSTEMCBEDパターンの取得
  • 密度関数理論 (DFT) による散乱ポテンシャルに基づくシミュレーションと実験パターンの比較.

主要な成果:

  • 酸素部位におけるアスフェリックなバレンスの電子電荷の蓄積に起因するCBEDパターンの低角散乱における観測された強度の非対称性.
  • 極域を持つ緊張した SrTiO3 フィルムの原子の移転に対するCBED パターンの高角散射部分の感受性が実証された.

結論:

  • 4DSTEMは 原子レベルの電子と構造的性質を特徴づける強力な技術です
  • この研究は,4D STEMが微妙な原子の移転と電子分布の非対称性を検出する能力を強調しており,これは材料の振る舞いを理解する上で極めて重要です.