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相关概念视频

X-ray Crystallography02:18

X-ray Crystallography

23.9K
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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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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相关实验视频

Updated: Jul 6, 2025

Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples

Published on: June 19, 2018

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一个模块化的桌面设置,用于超快的X射线衍射.

W Lu, M Nicoul, U Shymanovich

    The Review of scientific instruments
    |January 8, 2024
    PubMed
    概括
    此摘要是机器生成的。

    一个新的桌面设置使得使用激光驱动的等离子X射线源的femtosecond时间分辨率X射线衍射. 这种可访问的系统实现了研究材料动态的高精度.

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    相关实验视频

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    Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
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    On-Chip Crystallization and Large-Scale Serial Diffraction at Room Temperature
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    科学领域:

    • 材料科学 材料科学 材料科学
    • 凝聚物质物理学 凝聚物质物理学
    • 射线科学X射线科学X射线科学

    背景情况:

    • 五秒时间解析的X射线衍射 (TRXRD) 对于研究超快的材料动力学至关重要.
    • 现有的TRXRD设置可能很复杂,缺乏可访问性.
    • 开发紧的,用户友好的TRXRD系统对于更广泛的研究应用是必不可少的.

    研究的目的:

    • 介绍一个新的桌面设置为femtosecond时间解析的X射线衍射.
    • 为了展示TRXRD实验的模块化和可访问的设计.
    • 为了展示系统在低重复率下进行高精度测量的能力.

    主要方法:

    • 使用一个Cu Kα (8.05 keV) 激光驱动的等离子体X射线源.
    • 实施了一个前脉冲方案以优化Kα-收益率.
    • 采用放大式多层X射线镜 (蒙特尔-赫利奥斯几何) 来收集辐射.
    • 使用气体电离室探测器进行衍射信号正常化.
    • 在激光激发的表层Bi膜上进行了时间分辨率衍射实验.

    主要成果:

    • 在10 Hz的重复速率下实现了>10 ^ 5 Cu Kα光子/脉冲的准聚合流.
    • 证明了测量相对信号变化<1%的能力.
    • 在表层Bi膜上成功执行了时间分辨率衍射.
    • 在多晶样品上验证了Debye-Scherrer测量的设置.

    结论:

    • 开发的桌面设置为 femtosecond 时间分辨率的X射线衍射提供了一个可访问和高效的平台.
    • 模块化设计提高了可用性和组件可访问性.
    • 该系统适用于研究各种材料的超快动态,包括薄膜和多晶样品.