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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...
23.9K
X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

3.8K
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...
3.8K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

42.5K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
42.5K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.5K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.5K

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相关实验视频

Updated: Jul 3, 2025

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis

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通过对分布函数对纳米晶体的结构分析,将电子衍射与晶体倾斜相结合.

Linshuo Guo1, Shitao Wu1, Zhengyang Zhou2

  • 1School of Physical Science and Technology, and Shanghai Key Laboratory of High-resolution Electron Microscopy, ShanghaiTech University, Shanghai 201210, People's Republic of China.

IUCrJ
|February 16, 2024
PubMed
概括

一种新的倾斜电子衍射对分布函数 (ePDF) 方法改善了纳米粒子结构分析. 这种倾斜ePDF技术提高了数据质量,使得纳米材料中的原子结构能够更准确地确定.

关键词:
在PDF中改进.晶体倾斜倾斜的情况电子对的分布函数是电子对的分布函数.地方结构 地方结构纳米颗粒是一种纳米粒子.

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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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Characterization of Nanocrystal Size Distribution using Raman Spectroscopy with a Multi-particle Phonon Confinement Model
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Characterization of Nanocrystal Size Distribution using Raman Spectroscopy with a Multi-particle Phonon Confinement Model

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相关实验视频

Last Updated: Jul 3, 2025

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Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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Characterization of Nanocrystal Size Distribution using Raman Spectroscopy with a Multi-particle Phonon Confinement Model
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Characterization of Nanocrystal Size Distribution using Raman Spectroscopy with a Multi-particle Phonon Confinement Model

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术 纳米技术
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 对分布函数 (PDF) 分析对于理解纳米材料结构至关重要,包括结晶性和局部原子乱.
  • 传统的电子衍射PDF (ePDF) 方法难以获得更大的纳米粒子的连续衍射环,限制了数据可靠性.
  • 高质量的散射信号对于准确的纳米材料结构分析至关重要.

研究的目的:

  • 引入和验证一种新的倾斜电子衍射对分布函数 (tilt-ePDF) 方法.
  • 为了提高数据质量和ePDF的兼容性,用于纳米材料的结构特征.
  • 为了提高纳米粒子结构参数精制的准确性.

主要方法:

  • 通过将电子衍射与样本倾斜相结合,开发了倾斜-ePDF技术.
  • 从不同尺寸的金纳米粒子和多晶膜中收集了倾斜系列电子衍射图案.
  • 在获得的倾斜系列数据上进行了ePDF分析.

主要成果:

  • 倾斜-ePDF方法成功增强了衍射环的连续性.
  • 在使用 tilt-ePDF 的高散射角度范围内观察到更好的信号噪声比.
  • 与传统的ePDF相比,Tilt-ePDF数据产生了更准确的结构参数和更低的残余因子.

结论:

  • 倾斜ePDF方法为纳米粒子的ePDF分析提供了显著的进步.
  • 该技术提供了一种可靠的方法,可以从纳米材料中获得精确的局部结构信息.
  • 倾斜-ePDF增强了电子衍射的功能,用于详细的结构特征.