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関連する概念動画

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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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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時間解像度X線吸収スペクトロスコーピーは,水窓の高調和源を使用する.

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
まとめ

テーブルの上での時間解像度X線吸収スペクトロスコーピー (TR-XAS) を開発しました この技術は,CF4+とSF6+のような単離分子における光誘発反応の研究を可能にします.

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科学分野:

  • 化学物理学
  • 分子光譜法
  • アットセカンド科学

背景:

  • 時間解像度X線吸収光譜 (TR-XAS) は通常,大きな施設に限られています.
  • 以前のTR- XAS研究は,サブピコ秒解像度と凝縮された段階に限定されていました.

研究 の 目的:

  • コンパクトなソースを使用してTR-XASでフェムト秒の時間解像度を達成します.
  • 単離されたガス相分子における光誘発化学反応を調査する.
  • CF4+とSF6+で元素特有の電子移行を検知する.

主な方法:

  • 350 eVまでの光子を生成する卓上高調和源の開発.
  • 単離されたCF4+およびSF6+分子をガス相で研究するためにTR-XASの適用.
  • 炭素Kエッジと硫黄Lエッジの元素固有の探査.

主要な成果:

  • 低フェムト秒時間解像度のTR-XASの実現
  • CF4+とSF6+で以前未調査の光誘発化学反応の観察
  • 反応経路の特徴と対称性破壊効果の観察.

結論:

  • テーブルの上のTR-XASは,ガス相における分子動態の高解像度研究を可能にします.
  • この研究は,分子反応中の対称性破裂とライドバーグ・バレンスの混合に関する洞察を示しています.
  • この進歩は,超高速な化学プロセスを調査するための新しい道を開きます.