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相关概念视频

$Interference and Diffraction$ 02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.

$X-ray Diffraction of Biological Samples$ 01:10

X-ray Diffraction of Biological Samples

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...

Coordination Number and Geometry

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.

Predicting Molecular Geometry

Predicting Molecular Geometry

VSEPR Theory for Determination of Electron Pair Geometries

Geometry of Hyperbolas

Geometry of Hyperbolas

A hyperbola consists of all points where the absolute difference of distances to two fixed points, called foci, remains constant. The standard equation isEach branch extends infinitely and approaches two asymptotes, which guide the curve’s behavior. The parameters a and b define key features: a measures the distance from the center to each vertex along the transverse axis, while b influences the slopes of the asymptotes. The asymptotes have equationsA rectangle centered at the origin with...

Beams

Beams

Beams are integral components of structural engineering and construction, designed to support loads applied at various points along their length. These long, straight members can be classified based on geometry, cross-section, support type, and equilibrium condition.
Based on geometry, beams can be straight, tapered, or curved. Straight beams are the most common type and have a constant cross-section throughout their length. Tapered beams, on the other hand, have a varying cross-section along...

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相关实验视频

Updated: Feb 7, 2026

$High Pressure Single Crystal Diffraction at PX^2$

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移动光束衍射几何学:一个衍射扫描探头的DIAD应用.

Alberto Leonardi¹, Andrew James¹, Christina Reinhard^2,3

¹Physical Sciences Diamond Light Source Diamond House - Harwell Science and Innovation Campus Didcot OxfordshireOX11 0DE United Kingdom.

Journal of applied crystallography

|February 6, 2026

概括

双成像和衍射 (DIAD) 光线线使用一种新的移动光束衍射几何学来进行精确的材料分析. 这种技术在实验中准确量化微观结构,应变和相位变化,这对于能源和生物医学应用至关重要.

关键词:

在DIAD的光束线上.面积探测器的衍射几何校准.分散扫描探头的探头.移动光束的衍射几何结构.最接近邻居的几何学校准.

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相关实验视频

Last Updated: Feb 7, 2026

$High Pressure Single Crystal Diffraction at PX^2$

High Pressure Single Crystal Diffraction at PX^2

Published on: January 16, 2017

$On-Chip Crystallization and Large-Scale Serial Diffraction at Room Temperature$

On-Chip Crystallization and Large-Scale Serial Diffraction at Room Temperature

Published on: March 11, 2022

$Microcrystal Electron Diffraction of Small Molecules$

Microcrystal Electron Diffraction of Small Molecules

Published on: March 15, 2021

科学领域:

材料科学与工程材料科学与工程
同步射线辐射技术同步射线辐射技术
纳米技术和先进材料

背景情况:

量化材料的行为 (微观结构,应变,相位) 对于储能,碳捕获和生物医学工程至关重要.
现有的方法需要多个仪器,导致数据的空间和时间分离.
钻石光源的双成像和衍射 (DIAD) 束线旨在克服这些局限性.

研究的目的:

在DIAD光线线上引入和验证一种新的移动光束衍射几何.
评估该技术的几何校准和数据减少程序的可靠性.
为光线线用户提供移动光束衍射几何学的定量评估.

主要方法:

通过两个独立的光束利用了近似同时的X射线计算机断层扫描和X射线粉碎衍射.
实现了"图像引导衍射"模式,使用扫描微米大小的衍射束.
对移动光束衍射几何学校准和数据缩小进行了定量评估.

主要成果:

移动光束衍射几何在传统传输探测器几何中最敏感.
柯克帕特里克-贝兹镜像运动导致射线探测器的刚性转换,而不会改变入射射线的角度.
最近邻校准的准确性与小样本区域距离的自我校准相美.
移动光束衍射几何学的绝对误差仍然低于0.01%.

结论:

在DIAD的新型移动光束衍射几何学允许精确的,空间相关的测量.
这种技术可用于研究快速演变和运动敏感的过程和样本.
经过验证的几何和校准方法为DIAD用户提供了宝贵的参考.