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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
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.4K
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...
3.4K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.2K
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.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.2K
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.2K
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,...
1.2K
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.7K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.7K
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

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Updated: May 4, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

8.6K

固体における電子スピンの相関性を,最適のダイナミックな解離によって保ちます.

Jiangfeng Du1, Xing Rong, Nan Zhao

  • 1Hefei National Laboratory for Physical Sciences at Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui 230026, China. djf@ustc.edu.cn

Nature
|October 30, 2009
PubMed
まとめ

研究者らは,固体における電子スピンの一貫性を維持するために最適なダイナミックな解離を実証した. この技術は,空間温度での量子コンピューティングと固体状態技術の進歩に不可欠なスピンコヒーレンス時間を大幅に延長します.

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

Published on: June 28, 2018

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

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

Published on: July 20, 2022

2.5K

関連する実験動画

Last Updated: May 4, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
15:58

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

Published on: December 3, 2013

8.6K
Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
09:00

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser

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9.3K
Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

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

Published on: July 20, 2022

2.5K

科学分野:

  • 量子物理学とは,量子物理学のことです.
  • 固体材料科学 固体材料科学とは
  • 量子情報科学とは,量子情報科学である.

背景:

  • 電子のスピン相関性は量子技術にとって不可欠ですが,環境の非相関性に敏感です.
  • ダイナミック・デコップリングは,スピン・デコエレンスに対抗する有望な戦略です.
  • ダイナミックな解離配列の最適化は,制御パルスとエラーを最小限にするために重要です.

研究 の 目的:

  • 固体系における最適の動的分離を実験的に実証する.
  • 電子のスピンコヒーレンス時間を保存および延長するために.
  • 室温量子連動制御の基礎を築くために.

主な方法:

  • パルス電子パラマグネティック共振 (EPR) スペクトロスコーピー.
  • 7パルス最適のダイナミックデコップリングシーケンスを実装.
  • 50Kから室温まで放射されたマロン酸結晶で実施された実験.

主要な成果:

  • 最適なダイナミック・デコップリングを使用して,約30マイクロ秒のスピンコヒーレンス時間を達成しました.
  • 制御されていない (0.04 μs) または単一パルス制御 (6.2 μs) ケースと比較して,コヒーレンス時間が大幅に延長されました.
  • 顕微鏡理論との比較を通じて,重要な電子スピンデコーエンンスメカニズムを特定しました.

結論:

  • 固体システムにおける最適の動的分離の実験的実現は,今や実現可能である.
  • この方法は,室温までの温度で電子のスピン相関性を著しく高めます.
  • 量子コンピューティングの潜在的な応用と,ダイヤモンドの窒素空白センターのような他の固体スピンシステムの制御.