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相关概念视频

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...
24.2K
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...
4.0K

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相关实验视频

Updated: Sep 11, 2025

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
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Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction

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几何衍射和刀刃衍射图案中的特征.

Xianming Meng, Ludovic Rapp

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    PubMed
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    此摘要是机器生成的。

    这项研究揭示了刀刃衍射边缘的新凸性,在反射和穿透衍射模式中观察到. 这个现象,这个现象.

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    High Pressure Single Crystal Diffraction at PX^2
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    相关实验视频

    Last Updated: Sep 11, 2025

    Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
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    Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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    High Pressure Single Crystal Diffraction at PX^2
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    科学领域:

    • 光学和光子学 在光学和光子学.
    • 波浪现象是一种波浪现象.

    背景情况:

    • 刀刃衍射是一种成熟的光学现象,已被研究了200多年.
    • 最近的研究发现了一个新的特征:衍射边缘的洞性及其近至远场方向逆转.

    研究的目的:

    • 实验性地研究来自各种刀刃的衍射边缘的凸性.
    • 为观察到的刀刃衍射模式提供理论解释.

    主要方法:

    • 从各种刀刃类型进行了关于衍射的全面实验.
    • 采用基于无限小的结构的分散反射的方法进行理论分析.

    主要成果:

    • 观察并证实了在反射和透射衍射场景中衍射边缘的凸性.
    • 证明了边缘的方向逆转,从近场到远场.

    结论:

    • 这项研究验证了衍射边缘的凸性作为刀刃衍射的特征.
    • 扩散反射模型成功地解释了在质量和数量上观察到的衍射模式.