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相关概念视频

Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

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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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Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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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...
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
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相关实验视频

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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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时间分辨率的X射线吸收光谱与水窗高源

Yoann Pertot1, Cédric Schmidt2, Mary Matthews1,2

  • 1Laboratorium für Physikalische Chemie, ETH Zürich, 8092 Zürich, Switzerland.

Science (New York, N.Y.)
|January 7, 2017
PubMed
概括

我们开发了桌面时间分辨率的X射线吸收光谱 (TR-XAS) 以获得五秒分辨率. 这种技术可以研究 CF4+ 和 SF6+ 等单独分子中的光诱导反应.

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Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic
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High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis
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Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic
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Applying X-ray Imaging Crystal Spectroscopy for Use as a High Temperature Plasma Diagnostic

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High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis
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科学领域:

  • 化学物理
  • 分子光谱学
  • 一秒钟的科学

背景情况:

  • 时间分辨率的X射线吸收光谱 (TR-XAS) 通常仅限于大型设施.
  • 之前的TR- XAS研究仅限于分秒以下分辨率和缩短阶段.

研究的目的:

  • 使用紧源在TR-XAS中实现五秒时间分辨率.
  • 在气相分子中研究光诱导的化学反应.
  • 在CF4+和SF6+中探测元素特定的电子转换.

主要方法:

  • 开发一台高源,产生高达350eV的光子.
  • 用TR-XAS研究气相中分离的CF4+和SF6+分子.
  • 对碳K边缘和硫L边缘进行元素特定的探测.

主要成果:

  • 实现低秒时间分辨率的TR-XAS.
  • 在CF4+和SF6+中观察以前未经检查的光诱导化学反应.
  • 反应途径的表征和对称性破坏效应的观察.

结论:

  • 桌面TR-XAS能够在气相中进行高分辨率的分子动态研究.
  • 这项研究揭示了分子反应中对称性破坏和Rydberg-valence混合的洞察力.
  • 这种进步为研究超快的化学过程开辟了新的途径.