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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...
1.2K
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.9K
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...
1.9K
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

1.1K
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
1.1K
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
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

870
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...
870
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

5.1K
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...
5.1K

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Updated: Apr 28, 2026

High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
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High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy

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単分子磁石における電気駆動型核スピン共振

Stefan Thiele1, Franck Balestro2, Rafik Ballou1

  • 1CNRS, Inst NEEL, F-38042 Grenoble, France. Université Grenoble Alpes, Inst NEEL, F-38042 Grenoble, France.

Science (New York, N.Y.)
|June 7, 2014
PubMed
まとめ

科学者たちは,量子ビットの核スピンの電気制御を実証した. この方法は,超精細なスターク効果を使用し,核スピンベースの量子装置のより速く,より局所的な操作を可能にします.

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

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関連する実験動画

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High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy
08:55

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Published on: October 9, 2020

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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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科学分野:

  • 量子コンピューティング
  • 原子物理学 原子物理学とは
  • 固体物理学 固体物理学とは

背景:

  • 孤立した核スピンは,核スピンベースの量子ビットの開発に不可欠です.
  • 核スピンの一貫した操作は,通常,局所磁場に依存します.
  • 電気操作は,スピン制御のための速度と空間制限の利点を提供します.

研究 の 目的:

  • 電気場のみを用いた一貫した単一核スピン操作のための方法を提案し,実証する.
  • 核スピンベースの量子装置の電気制御の可能性を調査する.

主な方法:

  • 超精細なスターク効果を原子レベルの磁場変換器として利用する.
  • 核スピン状態の一貫した操作を達成するために電場を適用する.
  • シリコンのリンやビスムスのような核スピン系における量子力学的プロセスを調査する.

主要な成果:

  • 単一の核スピンの連動的な操作を,電気場のみで成功裏に実証した.
  • 電気回転制御のための実行可能なメカニズムとして,超微細なスターク効果の検証.
  • この方法が様々な核スピンシステムに適用可能であることを確認します.

結論:

  • 核スピンの電気操作は,直接の磁場適用なしに達成可能である.
  • 超微細なスターク効果は,核スピンベースの量子技術における電気制御のための一般的な経路を提供します.
  • この突破は,先進的で電気制御された量子装置の道を開く.