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Related Concept Videos

¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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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...
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Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.3K
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...
1.3K
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
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.3K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
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Related Experiment Video

Updated: Nov 16, 2025

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Collective strong coupling in a plasmonic nanocavity.

H Varguet1, A A Díaz-Valles1, S Guérin1

  • 1Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS, Université Bourgogne Franche-Comté, 9 Avenue Savary, BP 47870, 21078 Dijon Cedex, France.

The Journal of Chemical Physics
|February 28, 2021
PubMed
Summary
This summary is machine-generated.

Quantum plasmonics enables nanoscale cavity quantum electrodynamics (cQED) by leveraging plasmonic nanocavities. This study reveals deviations from standard laws in collective strong coupling, impacting Rabi splitting and quantum emission spectra.

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Area of Science:

  • Quantum optics
  • Plasmonics
  • Nanophotonics

Background:

  • Cavity quantum electrodynamics (cQED) principles are extended to the nanoscale using plasmonic nanocavities.
  • Strong subwavelength confinement of plasmon modes in metal nanostructures is key.

Purpose of the Study:

  • To detail collective strong coupling phenomena in plasmonic nanocavities.
  • To compare and contrast these phenomena with traditional cQED.
  • To investigate deviations from established theoretical laws.

Main Methods:

  • Theoretical analysis of collective strong coupling.
  • Investigation of plasmonic nanocavity properties.
  • Examination of quantum electrodynamic effects at the nanoscale.

Main Results:

  • Observed significant deviations in Rabi splitting from the standard NeΔΩ1 law.
  • Identified the collective Lamb shift as a crucial factor.
  • Analyzed the influence of quantum corrections on emission spectra.

Conclusions:

  • Collective strong coupling in plasmonic nanocavities exhibits unique characteristics compared to cQED.
  • Standard theoretical models may require modification for nanoscale plasmonic systems.
  • Quantum effects play a critical role in understanding light-matter interactions at the nanoscale.