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相关概念视频

X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

4.1K
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...
4.1K
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

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相关实验视频

Updated: Sep 18, 2025

Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
10:12

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

Published on: June 19, 2018

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在OMEGA EP激光器上的多X射线衍射.

D N Polsin1,2, J R Rygg1,2,3, D T Bishel1,3

  • 1Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623-1299, USA.

The Review of scientific instruments
|June 24, 2025
PubMed
概括
此摘要是机器生成的。

研究人员在动态压缩实验中展示了一种用于X射线衍射测量的新方法. 该技术捕捉了在极端压力下等材料的快速相变,推进了材料科学研究.

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

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Fully Autonomous Characterization and Data Collection from Crystals of Biological Macromolecules
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Fully Autonomous Characterization and Data Collection from Crystals of Biological Macromolecules

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相关实验视频

Last Updated: Sep 18, 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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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene

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Fully Autonomous Characterization and Data Collection from Crystals of Biological Macromolecules
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Fully Autonomous Characterization and Data Collection from Crystals of Biological Macromolecules

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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
  • 高压物理 高压物理

背景情况:

  • 动态压缩实验对于理解极端条件下的材料行为至关重要.
  • 之前的方法缺乏时间分辨率来捕捉快速相位转换.
  • 激光驱动的压缩提供了一种独特的途径来实现高压.

研究的目的:

  • 展示了一种新的方法,用于在单次动态压缩过程中以时间分辨率进行X射线衍射.
  • 为了捕捉和分析网格层面的超快相变.
  • 为制约状态方程和理解材料动力学提供新的数据.

主要方法:

  • 使用OMEGA EP激光器进行动态压缩实验.
  • 采用超快的X射线框架摄像机收集多个时间隔离的衍射快照.
  • 实现了400ps的时间分辨率,并有可能实现200ps的分辨率和广泛的2θ散射角度覆盖.

主要成果:

  • 在一次激光射击中成功测量了多个暂时解析的粉末X射线衍射模式.
  • 观察了 (Zr) 在拉坡压缩中转化为高压β相.
  • 在动态压缩下限制了Zr的原子结构和压力密度方程状态.

结论:

  • 开发的X射线衍射平台可以在现场研究一次性动态压缩下相变的相变.
  • 这种技术对于限制过渡压力和理解动力学,歇斯底里和转移稳定性至关重要.
  • 为验证材料模型和在极端条件下探索基本物理提供了强大的工具.