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Gyroscope: Precession01:24

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Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
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The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Electron Spin Resonance Micro-imaging of Live Species for Oxygen Mapping
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自由電子を用いたスピン歳差運動の検出

Antonín Jaroš1, Michael S Seifner1, Johann Toyfl1

  • 1Vienna Center for Quantum Science and Technology, Atominstitut, USTEM, Technische Universität Wien, Stadionallee 2, Vienna 1020, Austria.

ACS nano
|January 20, 2026
PubMed
まとめ
この要約は機械生成です。

本研究では、ナノスケール磁気共鳴イメージングのために、スピン共鳴分光法と透過型電子顕微鏡（TEM）を組み合わせた新しい技術を紹介します。これにより、材料内のマイクロ波駆動スピン遷移を直接観察できます。

キーワード:
電子常磁性共鳴電子スピン共鳴自由電子マイクロ波分光法スピンスピン歳差運動透過型電子顕微鏡

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科学分野:

  • 物理学
  • 材料科学
  • 分光法

背景:

  • 透過型電子顕微鏡（TEM）は、ナノスケールイメージングのための強力なツールです。
  • ナノスケールでの材料のスピンダイナミクスの特性評価は、高度な電子および磁気デバイスの開発にとって重要です。
  • スピン遷移を調査するための既存の方法は、空間分解能が低いか、特殊な装置を必要とすることがよくあります。

研究 の 目的:

  • マイクロ波（MW）駆動スピン遷移の局所的、インサイチュ検出のための新しい方法を開発すること。
  • TEMの自由空間電子ビームをスピン分光法の信号受信機として利用すること。
  • スピン励起のナノスケール探索を可能にすること。

主な方法:

  • スピン共鳴分光法とTEMの組み合わせ。
  • TEMの磁場を用いたスピン状態の分極。
  • GHz周波数での連続波マイクロ波励起のためのカスタムマイクロ共振器の使用。
  • スピン歳差運動信号を分離するためのマイクロ波場に同期した位相ロック検出の利用。

主要な成果:

  • マイクロ波駆動スピン遷移の局所的なインサイチュ検出を実証しました。
  • TEM電子ビームを信号受信機として使用することに成功しました。
  • スピン歳差運動誘起電子ビーム偏向の位相ロック検出を実現しました。
  • ナノスケールでのスピン励起を調査する能力を示しました。

結論:

  • 提示された技術は、ナノスケールスピン励起研究に新しい道を提供します。
  • この方法は、材料内のスピンダイナミクスの直接的な視覚化を可能にします。
  • 高度な材料におけるスピン関連現象のインサイチュ特性評価の可能性を開きます。