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関連する概念動画

X-ray Crystallography02:18

X-ray Crystallography

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...
Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

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 crystal...

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関連する実験動画

Updated: Jul 11, 2026

Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092
08:53

Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092

Published on: October 2, 2017

最小の正方形から電子集団のパラメータをX線 difraktion データ精細化

P Coppens, L Csonka, T V Willoughby

    Science (New York, N.Y.)
    |February 20, 1970
    PubMed
    まとめ
    この要約は機械生成です。

    最小四角精細化の新しい方法は,分子電子密度を決定するためにX線 difraktion データを分析します. この電荷密度分析は,アルファオクサリック酸二酸化水素とシアヌリック酸における電荷移動を明らかにした.

    さらに関連する動画

    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

    Neutron Crystallography Data Collection and Processing for Modelling Hydrogen Atoms in Protein Structures
    10:10

    Neutron Crystallography Data Collection and Processing for Modelling Hydrogen Atoms in Protein Structures

    Published on: December 1, 2020

    関連する実験動画

    Last Updated: Jul 11, 2026

    Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092
    08:53

    Biochemical and Structural Characterization of the Carbohydrate Transport Substrate-binding-protein SP0092

    Published on: October 2, 2017

    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

    Neutron Crystallography Data Collection and Processing for Modelling Hydrogen Atoms in Protein Structures
    10:10

    Neutron Crystallography Data Collection and Processing for Modelling Hydrogen Atoms in Protein Structures

    Published on: December 1, 2020

    科学分野:

    • クリスタログラフィーです.
    • 量子化学とは,量子化学である.
    • マテリアルサイエンス 材料科学

    背景:

    • 正確な分子構造と電子分布は,化学的性質を理解するために不可欠です.
    • 従来の方法は,構造的パラメータと電荷密度のパラメータを同時に解くのに苦労するかもしれません.

    研究 の 目的:

    • X線屈折データを分析するための新しい最小二乗精製技術を開発し,適用する.
    • 分子電子密度分布と関連する電荷パラメータを決定する.

    主な方法:

    • 最小の正方形の精細化によるX線微分データ.
    • 精製パラメータとして原子軌道産物の集団を利用する.
    • 補完的な中性子 difraktion データを有効化のために使用します.

    主要な成果:

    • この方法は,アルファオクサリック酸二酸化水素とシアヌリック酸に成功裏に適用されました.
    • 構造パラメータと負荷密度のパラメータを同時に決定することができました.
    • pi (π) からシグマ (σ) 軌道への電荷移動の証拠は,両方の分子で観察されました.

    結論:

    • 開発された精製手順は,詳細な分子電荷密度分析のための堅牢なアプローチを提供します.
    • 発見は,電子構造と分子内の電荷再分配に関する洞察を提供します.