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相关概念视频

Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

269
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
269
Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

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Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
306
Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

427
An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
427
Atomic Absorption Spectroscopy: Overview01:27

Atomic Absorption Spectroscopy: Overview

496
Atomic absorption spectroscopy (AAS) is a technique used to analyze elements by measuring electromagnetic radiation (EMR) absorbed by atoms, which causes them to transition to a higher-energy orbit. The most crucial step in AAS is atomization, where the analyte is converted into gas-phase atoms, typically through a flame or furnace. Some of these atoms become thermally excited in the flame, while most remain in the ground state.
When irradiated by EMR of a particular wavelength, these...
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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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Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

269
Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
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Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic
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推进模拟ITER核心X射线水晶光谱的先进模拟

Xinyi Jin1, Zhifeng Cheng2, Junli Zhang1

  • 1State Key Laboratory of Advanced Electromagnetic Technology, International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.

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概括
此摘要是机器生成的。

更新了X射线模拟分析 (XRSA) 代码,包括ITER核心X射线水晶光谱 (XRCS-Core) 诊断的自动聚焦和偏振效应. 这些更新提高了模拟双反射系统性能的准确性.

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科学领域:

  • 等离子体物理学的物理学
  • 频谱学是一种光谱学.
  • 材料科学 材料科学 材料科学

背景情况:

  • ITER核心X射线水晶光谱 (XRCS-Core) 诊断需要准确的建模来进行高光谱分辨率测量.
  • 诊断采用双反射配置与高度定向的 Pyrolytic Graphite (HOPG) 和分析晶体.

研究的目的:

  • 为了增强X-Ray模拟分析 (XRSA) 代码用于XRCS-Core诊断.
  • 将自动聚焦和偏振效应纳入模拟代码.
  • 为了准确地建模XRCS-Core系统的光谱性能.

主要方法:

  • 开发和更新了X射线模拟分析 (XRSA) 代码.
  • 实施的射线跟踪和混合代码模拟技术.
  • 集成的自动聚焦用于HOPG和偏振效应.

主要成果:

  • 更新的XRSA代码为XRCS-Core系统提供了更准确的建模.
  • 极化显著影响双反射系统的性能.
  • 极化和系统布局的结合效应导致频道间的性能变化.

结论:

  • 更新后的XRSA代码准确地模拟了XRCS-Core诊断器的光谱性能.
  • 极化是双反射系统性能的一个关键因素.
  • 需要进一步分析以了解由于系统布局和两极分化而导致的性能变化.