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相关概念视频

X-ray Crystallography02:18

X-ray Crystallography

26.4K
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...
4.9K

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相关实验视频

Updated: Feb 24, 2026

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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从衍射测量中重建混合物的状态.

Pierre Thibault1, Andreas Menzel

  • 1Physics Department, Technische Universität München, 85748 Garching bei München, Germany. pierre.thibault@tum.de

Nature
|February 8, 2013
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的分析方法,用于表征衍射成像系统,即使具有部分连贯性. 这种基于图形学的技术增强了图像分辨率,并减少了波场成像中的工件.

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X-ray Powder Diffraction in Conservation Science: Towards Routine Crystal Structure Determination of Corrosion Products on Heritage Art Objects
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Synthesis and Microdiffraction at Extreme Pressures and Temperatures
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相关实验视频

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X-ray Powder Diffraction in Conservation Science: Towards Routine Crystal Structure Determination of Corrosion Products on Heritage Art Objects
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Synthesis and Microdiffraction at Extreme Pressures and Temperatures

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科学领域:

  • 光学和光子学 在光学和光子学.
  • 图像重建 图像的重建
  • 计量学 计量学 计量学

背景情况:

  • 连贯衍射成像 (CDI) 需要高连贯性,以从衍射强度进行无透镜图像重建.
  • 现实世界成像通常涉及部分连贯性和不完美的检测,需要统计光学或状态叠加.
  • 描述动态样本行为是成像学中日益增长的实验目标.

研究的目的:

  • 开发一种通用分析方法来表征被描述为低级混合状态的衍射成像系统.
  • 量化补偿和描述成像系统中各种脱凝的来源.
  • 为了使样本中的混合状态能够进行高分辨率的成像,包括量子混合物和动态过程.

主要方法:

  • 在衍射成像中的低级混合状态表征的一般分析方法的开发.
  • 使用实验数据和模拟来验证重建技术.
  • 在ptychography的基础上构建,与量子状态断层学有着密切的联系.

主要成果:

  • 开发的重建技术从数量上补偿和表征脱凝的来源.
  • 已被证明适用于高分辨率显微镜,波浪传感和波动测量.
  • 实现混合状态的高分辨率成像,包括量子混合物和像振动或流动这样的随机过程.

结论:

  • 这种新的方法放松了图解学中严格的实验条件,减少了对成像文物的敏感性.
  • 该方法为分析复杂的波场和样本动态提供了一个强大的框架.
  • 这种技术为各种科学应用推进了衍射成像的能力.