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関連する概念動画

Electron Behavior00:54

Electron Behavior

101.7K
Overview
Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the...
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Thomson's e/m Experiment01:19

Thomson's e/m Experiment

4.4K
In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The...
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X-ray Crystallography02:18

X-ray Crystallography

24.2K
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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Subatomic Particles03:37

Subatomic Particles

98.5K
Dalton was only partially correct about the particles that make up matter. All matter is composed of atoms, and atoms are composed of three smaller subatomic particles: protons, neutrons, and electrons. These three particles account for the mass and the charge of an atom.
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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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X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

4.0K
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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関連する実験動画

Updated: Sep 10, 2025

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
08:44

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene

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電子 difraktion で部分電荷の実験的決定

Soheil Mahmoudi1,2, Tim Gruene3, Christian Schröder4

  • 1Department of Inorganic Chemistry, University of Vienna, Vienna, Austria.

Nature
|August 20, 2025
PubMed
まとめ
この要約は機械生成です。

電子 difraktion を用いて原子の部分電荷を決定する新しい実験方法を開発した. この技術はイオン散乱因子モデリングと呼ばれ 様々な化学化合物の分子構造と反応性を正確に理解できます

さらに関連する動画

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
11:14

Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

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関連する実験動画

Last Updated: Sep 10, 2025

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
08:44

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene

Published on: August 22, 2017

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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope
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Comprehensive Characterization of Extended Defects in Semiconductor Materials by a Scanning Electron Microscope

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科学分野:

  • クリスタルグラフィー
  • 量子化学について
  • 材料科学

背景:

  • 原子の部分電荷は分子行動を理解するために不可欠ですが,正確な量子力学的な定義はありません.
  • 原子部分電荷の正確な決定は,化学合成,材料科学,理論化学において重要な意味を持つ.
  • 原子の部分電荷を定量化するための既存の方法は限られており,現在まで一般的な実験方法はありません.

研究 の 目的:

  • 結晶化合物の原子部分電荷を定量化するための新しい実験方法を導入する.
  • どんな結晶材料にも適用できる 汎用的なアプローチを提供すること.
  • 精密な電荷決定を通じて分子構造,相互作用,反応性の理解を深める.

主な方法:

  • この研究では,電子微分法による結晶構造の決定に基づいた新しい実験方法が導入されています.
  • この方法は,イオン散乱因子モデリングと呼ばれ,標準的な電子結晶学ワークフローに統合されています.
  • 専門的なソフトウェアや高度な専門知識は不要で,この方法は広く利用できます.

主要な成果:

  • この方法は,様々な結晶化合物の個々の原子に 部分電荷を割り当てるのに成功した.
  • 抗生物質シプロフロクサシン,アミノ酸 (ヒスティジン,チロシン),ゼオライトZSM-5を含む多様な例において多用途性を示した.
  • イオン分散因子のモデリングは,分子構造のより包括的かつ正確な理解を提供します.

結論:

  • 開発された実験方法は,原子部分電荷を決定するための一般的でアクセス可能なアプローチを提供します.
  • イオン散乱因子のモデリングは,分子構造と化学的性質の正確な理解を大幅に進める.
  • この突破は化学合成,材料科学,計算化学の応用に 新たな道を開きます