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Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
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UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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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.
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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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).
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UV–Vis Spectroscopy of Conjugated Systems01:32

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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Spectrophotometry: Introduction01:16

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Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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コロイド量子ドットスペクトロメーター

Jie Bao1, Moungi G Bawendi2

  • 11] Department of Electronic Engineering, Tsinghua University, Beijing, 100084, China [2] Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA [3] Department of Physics, California Institute of Technology, Pasadena, California 91125, USA.

Nature
|July 3, 2015
PubMed
まとめ

研究者は,現在の設計の限界を克服する新しい量子ドットマイクロスペクトロメーターを開発しました. この新しい装置は,同時にスペクトル帯を検出するためにコロイド量子ドットを使用し,小型化され,費用対効果の高いスペクトロスコピーを可能にします.

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科学分野:

  • スペクトル検査と光学機器.
  • コロイド量子ドットを使った材料科学.

背景:

  • スペクトロスコピーは科学分野において不可欠であり,小型化され,手頃な価格のシステムに対する需要を高めています.
  • 既存のマイクロスペクトロメーターは,インターフェロメトリック光学による光子効率,解像度,スペクトル範囲の制限に直面しています.

研究 の 目的:

  • 現在のマイクロスペクトロメーター設計の限界を克服するために.
  • コロイド量子ドットを用いた新しいマイクロスペクトロメーターを導入する.

主な方法:

  • 伝統的なインターフェロメトリック光学は,コロイド量子ドットの二次元吸収フィルター配列に置き換えられました.
  • 複数のスペクトル帯を同時に検出するために,波長マルチプレキシングを使用しています.
  • ターゲットスペクトルを決定するために計算再構築を使用しました.

主要な成果:

  • 300 nmのスペクトル範囲をカバーする195種類の異なる量子ドット型を持つ量子ドットマイクロスペクトロメーターを実証しました.
  • 精密な測定を達成し,1ナノメートルほどの小さなスペクトルピークシフトを検出しました.
  • 業績を大幅に改善する可能性を示した.

結論:

  • 量子ドットマイクロスペクトロメーターは,主要な制限を克服し,従来の設計に有効な代替案を提供します.
  • この技術は,様々な用途に不可欠な小型化され,費用対効果の高いスペクトロメーターを可能にします.
  • 調節可能なバンドギャップと統合の容易さにより,量子ドットは将来のスペクトル顕微鏡装置の有望な材料として位置づけられています.