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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

856
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
856
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
1.8K
Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

3.0K
All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
3.0K
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

1.2K
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

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All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not contribute...
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Diamagnetism01:26

Diamagnetism

2.7K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.7K

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RETRACTED: ダイヤモンド磁気計による単一プロトンスピン検出

M Loretz1, T Rosskopf1, J M Boss1

  • 1Department of Physics, ETH Zurich, Otto Stern Weg 1, 8093 Zurich, Switzerland.

Science (New York, N.Y.)
|October 18, 2014
PubMed
まとめ

研究者は,ダイヤモンドの窒素空白 (NV) センターを使用して個々の陽子スピンを検出しました. この画期的な発見により,原子規模の磁気共鳴画像と分子内の原子の位置のマッピングが可能になった.

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科学分野:

  • 量子物理学とは,量子物理学のことです.
  • ナノテクノロジー ナノテクノロジー
  • マグネティックレゾナンスイメージング (MRI)

背景:

  • 磁気共鳴画像 (MRI) は,原子規模の解像度を達成することを目的としています.
  • 3Dで原子の位置をマッピングすることは,分子科学における重要な課題です.

研究 の 目的:

  • ダイヤモンドの窒素空白 (NV) センターを使用して個々の陽子スピンの検出を実証します.
  • 原子スケールのイメージングのためのNVセンターの可能性を調査する.

主な方法:

  • ダイヤモンドチップの窒素空白 (NV) センターを利用した.
  • シングル・プロトン同一性を確認するために,ジーマン効果と量子コヒーレント回転を用いた.
  • NVセンターの高精度フィールドをイメージンググラデーションとして使用しました.

主要な成果:

  • 単一の,孤立した陽子のスピンを成功裏に検出しました.
  • 陽子のスピン同一性をスペクトロスコピック法で確認した.
  • 準ナノメートル精度 (<1 nm) でプロトン-NV距離を決定した.

結論:

  • 個々の陽子のスピンは,NVセンターを使用して検出および特徴づけることができます.
  • このテクニックは,原子規模の磁気共鳴画像処理への道を提供します.
  • ナノスケール画像と材料科学における潜在的な応用.