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相关概念视频

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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X-ray Imaging01:24

X-ray Imaging

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German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
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X-ray Crystallography02:18

X-ray Crystallography

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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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Raman Spectroscopy: Overview01:20

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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Scanning Electron Microscopy01:07

Scanning Electron Microscopy

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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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相关实验视频

Updated: Sep 11, 2025

Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
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如何使用RSoXS

P J Dudenas1, L Q Flagg1, K Goetz1

  • 1National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.

The Journal of chemical physics
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PubMed
概括
此摘要是机器生成的。

响应软X射线散射 (RSoXS) 为研究有机薄膜提供了高对比度. 本教程指导研究人员对材料科学和有机电子学的RSoXS实施和分析.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 软物质物理学 软物质物理学
  • 频谱学是一种光谱学.

背景情况:

  • 响应软X射线散射 (RSoXS) 对于分析有机薄膜中的组成和方向异质性至关重要.
  • 它的有效性源于利用原子吸收边缘附近的光学常数变化,提供高对比度和对分子方向的灵敏度.
  • 尽管在有机电子产品中具有实用性,但全面的实施和分析指导仍然有限.

研究的目的:

  • 为研究人员提供有关共振软X射线散射 (RSoXS) 的全面教程.
  • 详细介绍RSoXS的基本原理,对比机制和实际应用.
  • 为了能够对软材料中的分子尺度结构进行定量分析.

主要方法:

  • 介绍近端X射线吸收细结构 (NEXAFS) 光谱学的原理.
  • 对RSoXS对比机制的解释.
  • 用多壁碳纳米管作为例子进行样本准备,测量和数据分析的逐步指南.
  • 使用NIST RSoXS模拟套件进行无模型分析和详细建模的演示.

主要成果:

  • 建立了RSoXS样品准备和测量的最佳实践.
  • 提出了定性和定量数据分析的方法.
  • 展示了RSoXS用于表征异质有机材料的实用性.

结论:

  • 本教程是实施和分析RSoXS实验的实用资源.
  • 它使新的和经验丰富的研究人员能够进行软材料的定量结构分析.
  • RSoXS是推动有机电子和材料科学研究的关键技术.