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関連する概念動画

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

1.5K
Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
1.5K
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
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
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.5K
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...
3.5K
The Bohr Model02:18

The Bohr Model

68.0K
Following the work of Ernest Rutherford and his colleagues in the early twentieth century, the picture of atoms consisting of tiny dense nuclei surrounded by lighter and even tinier electrons continually moving about the nucleus was well established. This picture was called the planetary model since it pictured the atom as a miniature “solar system” with the electrons orbiting the nucleus like planets orbiting the sun. The simplest atom is hydrogen, consisting of a single proton as...
68.0K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.4K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
2.4K

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Updated: May 6, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

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単一の電子をボース・アインシュタイン凝縮物と結合する.

Jonathan B Balewski1, Alexander T Krupp, Anita Gaj

  • 15. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.

Nature
|November 1, 2013
PubMed
まとめ
この要約は機械生成です。

ボーゼ-アインシュタイン凝縮物と相互作用する単一のライドバーグ電子は,フォノンを刺激し,集合的振動を引き起こします. この電子-物質の結合はイオンよりも強く,新しい量子現象を明らかにします.

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

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11:21

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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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.
  • 凝縮物質物理学 凝縮物質物理学
  • 原子物理学 原子物理学とは

背景:

  • 電子-フォノン結合は,超伝導性などの物質特性にとって根本的なものです.
  • バーディン-クーパー-シュリーファー超伝導性は,クーパーペアを形成する電子-フォノン相互作用から生じる.

研究 の 目的:

  • 単一の局所電子とボース・アインシュタイン凝縮体との相互作用を研究する.
  • 発生した電子・フォノン結合と凝縮液の動態を特徴づける.

主な方法:

  • 単一の電子がイオン核によって局所化されたライドバーグ結合状態の形成.
  • ボーゼ・アインシュタイン凝縮物との電子の相互作用の観測.
  • 電子の寿命とコンデンサート反応の測定.

主要な成果:

  • リードバーグ電子はフォノンを刺激し,コンデンサートの集合的振動を誘導する.
  • 電子-コンデンサート結合は,質量比により,イオン不純物よりも著しく強い.
  • 観測された長い電子寿命と有限サイズ効果は,コンデンサート周辺の探査に起因する.
  • リードバーグ電子の波動関数 (n=202) は,数千個の原子を網羅し,約8マイクロメートルまで広がっています.

結論:

  • 単一のライドバーグ電子はボース・アインシュタイン凝縮物と強く結合し,影響を与える.
  • 有利な質量比は,電子-フォノン結合の強さを高める.
  • 将来の研究は,電子軌道イメージング,フォノン媒介結合,量子光学の応用を探求することができます.