Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.9K
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...
2.9K
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.7K
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...
1.7K
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

3.8K
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...
3.8K
¹H NMR Signal Multiplicity: Splitting Patterns01:13

¹H NMR Signal Multiplicity: Splitting Patterns

8.5K
When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
8.5K
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

1.9K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.9K
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

2.2K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
2.2K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Influencing factors and diagnostic yield of second-look ultrasound-guided pleural biopsy based on CT characteristics: a real-world study.

Journal of thoracic disease·2026
Same author

A bibliometric analysis of <i>Moringa oleifera</i> during 2000-2024.

Open life sciences·2026
Same author

Transcriptional Heterogeneity of Cardiac Remodeling Between Type 1 and Type 2 Diabetes.

Biomedicines·2026
Same author

Health utility by Psoriasis Area and Severity Index response status after biologic induction therapy in Chinese patients with moderate to severe psoriasis.

Journal of comparative effectiveness research·2026
Same author

High-temperature performance of mortar reinforced with graphene-carbon nanotube hybrids.

Science progress·2026
Same author

Contrast-Enhanced Ultrasound Phenotypes in Hepatic Alveolar Echinococcosis: Pathological Correlations and Prediction of Vascular Invasion.

Academic radiology·2026

Related Experiment Video

Updated: Apr 11, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
07:39

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Published on: July 21, 2018

7.4K

Multipole coupling effects beyond the general plasmon hybridization theory.

Guo Zhou1, Liren Deng1, Hao Yu1

  • 1Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 9, 2026
PubMed
Summary
This summary is machine-generated.

Researchers observed complex plasmon coupling modes in silver nanoparticle dimers using near-field plasmon mapping. These findings reveal higher-order coupling beyond standard models, advancing understanding of plasmonic complexes.

Keywords:
dimer hotspotsmultipole couplingnear-field plasmon mappingplasmon hybridization model

More Related Videos

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
15:06

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle

Published on: January 3, 2016

13.5K
Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
08:19

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Published on: March 2, 2016

19.0K

Related Experiment Videos

Last Updated: Apr 11, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
07:39

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

Published on: July 21, 2018

7.4K
Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
15:06

Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle

Published on: January 3, 2016

13.5K
Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
08:19

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Published on: March 2, 2016

19.0K

Area of Science:

  • Plasmonics
  • Nanoparticle dimers
  • Surface physics

Background:

  • Understanding plasmon coupling in metallic nanoparticles is crucial for applications in sensing and optics.
  • Existing models, like plasmon hybridization, often simplify the complex interactions within nanoparticle dimers.

Purpose of the Study:

  • To investigate the detailed coupling mechanisms in silver nanoparticle homodimers and heterodimers.
  • To identify and characterize high-order multipole coupling modes beyond dipole-dipole interactions.

Main Methods:

  • Utilized full-wavelength near-field plasmon mapping.
  • Analyzed the symmetry and distribution of compressed surface charge lobes.

Main Results:

  • Observed gradual evolutions of multipole coupling modes in dimer hotspots.
  • Identified complex high-order coupling modes that deviate from standard plasmon hybridization predictions.
  • Documented intermediate states between dipole-dipole and quadrupole-quadrupole coupling.

Conclusions:

  • The study provides essential insights into the behavior of dimer hotspot systems.
  • Paves new avenues for exploring multipole coupling effects in complex plasmonic structures.