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Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

3.3K
Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
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Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

2.0K
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...
2.0K
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

1.5K
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.
1.5K
Atomic Absorption Spectroscopy: Overview01:27

Atomic Absorption Spectroscopy: Overview

4.1K
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...
4.1K
Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

1.8K
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...
1.8K
Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

1.1K
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...
1.1K

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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固体状態の人工原子の振幅スペクトロスコピー

David M Berns1, Mark S Rudner, Sergio O Valenzuela

  • 1Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Nature
|September 5, 2008
PubMed
まとめ

振幅スペクトロスコピーは,周波数の代わりにフィールドの振幅を使用して,量子システムを研究する新しい方法を提供します. この方法は,伝統的な周波数スペクトロスコピーの限界を克服し,特に高周波数帯の限界を克服します.

科学分野:

  • 量子力学は,量子力学という
  • スペクトル顕微鏡検査です.
  • 原子物理 原子物理学

背景:

  • 量子システムの行動は,スペクトル線を通して観測可能なエネルギーレベルの構造によって決定されます.
  • 従来の周波数スペクトロスコピーは,電磁場周波数をエネルギーレベル分離に合わせたように調整します.
  • 高周波スペクトル検査 (数十から数百ギガヘルツ) は,従来の方法に対して大きな課題を提示しています.

研究 の 目的:

  • 周波数スペクトロスコピーの補完的な技術として振幅スペクトロスコピーを導入する.
  • ブロードバンドの周波数ベースのアプローチの限界を克服し,特に高周波体制において.
  • 広帯域での量子システムの操作と特徴付けの方法を提供する.

主な方法:

  • ハーモニック・ドライビング・フィールドを利用して,人工の原子を固定周波数で回避されたエネルギーレベルの交差点を通過させる.
  • システムの応答の振幅依存からスペクトル学的情報を取得します.
  • パラメータ空間における"スペクトロスコピーのダイヤモンド"を分析し,干渉パターンと集団逆転を明らかにします.

主要な成果:

  • 振幅スペクトロスコピーは,量子システムのエネルギーレベル構造を成功裏に探査しています.

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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer
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Last Updated: Mar 18, 2026

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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer
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  • "スペクトロスコピーのダイヤモンド"は,明確な干渉パターンと集団逆転を示しています.
  • この技術は,特定のエネルギーレベルペアの間の移行を区別することによってスペクトルの特徴づけを可能にします.

    • 結論:

    • 振幅スペクトロスコピーは,量子システムの研究,特に高周波の挑戦に際して強力な代替手段を提供します.
    • この方法は,単一の,潜在的にはるかに低いドライビング周波数での振幅調節を活用します.
    • このアプローチは,量子システムのための幅広い帯域幅の操作と特徴付け機能を提供します.