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関連する概念動画

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...
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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
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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...
535
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

3.0K
When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
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Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
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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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原子スケール振動スペクトロスコーピーを用いた同位体拡散のイメージング

Ryosuke Senga1, Yung-Chang Lin2, Shigeyuki Morishita3

  • 1Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki, Japan. ryosuke-senga@aist.go.jp.

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|March 3, 2022
PubMed
まとめ

この研究は,振動スペクトロスコーピーを用いてグラフェンの原子レベルの同位体イメージングを実証しています. この技術は,炭素原子の自己拡散を成功裏に追跡し,ナノスケールの同位体工学の道を開きました.

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科学分野:

  • 材料科学
  • ナノテクノロジー
  • スペクトロスコーピー

背景:

  • 現在の同位体分析方法は,空間解像度が限られている (数百ナノメートル).
  • 原子レベルでの同位体検出は大きな課題でした
  • 電子探知器による振動スペクトロスコピーは高解像度ですが,原子レベルの同位体検出には欠けています.

研究 の 目的:

  • 原子レベルでの 明確な同位体画像を 達成するためです
  • グラフェンの炭素同位体の自己拡散を監視する.
  • ナノ同位体工学と追跡のための新しい方法論を確立する.

主な方法:

  • 炭素13 (13C) グラフェン内の炭素12 (12C) 原子のドメインを成長させる.
  • 拡散を促進するために600°Cで試料を冷却する.
  • 同位体マッピングのためにスキャニング伝送電子顕微鏡-電子エネルギー損失スペクトロスコーピー (STEM-EELS) を利用する.

主要な成果:

  • 13Cグラフェンの12C原子の明確な同位体イメージングを達成した.
  • 12C原子の急速な拡散と分離が観察されました.
  • グラフェンは2時間以内に100ナノメートルの領域で同位体均質になり,高い炭素原子の移動性を示した.

結論:

  • 原子レベルの振動スペクトロスコピーは,正確な同位体画像と拡散モニタリングを可能にします.
  • この発見は,グラフェンの炭素原子の自己拡散による高移動性を強調しています.
  • この技術は,ナノスケールの同位体工学,ラベル付け,追跡のための基本的なツールを提供します.