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

Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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 have a...
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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,...
NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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

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

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...
The Pauli Exclusion Principle03:06

The Pauli Exclusion Principle

The arrangement of electrons in the orbitals of an atom is called its electron configuration. We describe an electron configuration with a symbol that contains three pieces of information:
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...

You might also read

Related Articles

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

Sort by
Same author

Spin-charge transport in chirally induced spin selectivity.

The Journal of chemical physics·2026
Same author

Impact of shared facilities in advancing solid-state NMR research: 2025 edition.

Solid state nuclear magnetic resonance·2025
Same author

Optimisation and impact of gradient waveform modulation on Non-uniform Oscillating Gradient Spin-Echo sequences for microstructural characterisation.

Journal of magnetic resonance (San Diego, Calif. : 1997)·2025
Same author

Simulating a catalyst induced quantum dynamical phase transition of a Heyrovsky reaction with different models for the environment.

Journal of physics. Condensed matter : an Institute of Physics journal·2022
Same author

Current-induced forces in single-resonance systems.

Journal of physics. Condensed matter : an Institute of Physics journal·2021
Same author

Erratum for the Appendix of "Measuring small compartment dimensions by probing diffusion dynamics via Non-uniform Oscillating-Gradient Spin-Echo (NOGSE) NMR" [J. Magn. Reson. 237 (2013) 49-62].

Journal of magnetic resonance (San Diego, Calif. : 1997)·2017
Same journal

Erratum: Bacterial Turbulence at Compressible Fluid Interfaces [Phys. Rev. Lett. 136, 138301 (2026)].

Physical review letters·2026
Same journal

Unveiling Light-Quark Yukawa Flavor Structure via Dihadron Fragmentation at Lepton Colliders.

Physical review letters·2026
Same journal

Adaptable Route to Fast Coherent State Transport via Bang-Bang-Bang Protocols.

Physical review letters·2026
Same journal

Topological Transition and Emergence of Elasticity of Dislocation in Skyrmion Lattice: Beyond Kittel's Magnetic-Polar Analogy.

Physical review letters·2026
Same journal

Pound-Drever-Hall Method for Superconducting-Qubit Readout.

Physical review letters·2026
Same journal

Coupling a ^{73}Ge Nuclear Spin to an Electrostatically Defined Quantum Dot in Silicon.

Physical review letters·2026
See all related articles

Related Experiment Video

Updated: Jun 29, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Quantum parallelism as a tool for ensemble spin dynamics calculations.

Gonzalo A Alvarez1, Ernesto P Danieli, Patricia R Levstein

  • 1Facultad de Matemática, Astronomía y Física, Universidad Nacional de Córdoba, Córdoba, Argentina. galvarez@famaf.unc.edu.ar

Physical Review Letters
|October 15, 2008
PubMed
Summary
This summary is machine-generated.

We present an efficient quantum simulation method for spin-1/2 systems. This approach significantly reduces calculation time for local excitations in quantum computation and NMR experiments.

Related Experiment Videos

Last Updated: Jun 29, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Area of Science:

  • Quantum mechanics
  • Quantum information science
  • Computational physics

Background:

  • Simulating quantum evolutions of spin-1/2 systems is crucial for quantum computation and Nuclear Magnetic Resonance (NMR) experiments.
  • Current methods can be computationally intensive, especially for systems with many particles or complex interactions.

Purpose of the Study:

  • To develop an efficient method for calculating the dynamics of observables in spin-1/2 systems.
  • To reduce the computational time required for simulating quantum evolutions with local initial excitations.

Main Methods:

  • Proposing a novel simulation technique that utilizes a single entangled pure initial state.
  • Constructing this state as a superposition with random phases from the pure elements of the initial mixture.
  • Leveraging the self-averaging property of observables for efficient computation.

Main Results:

  • Demonstrated a drastic reduction in calculation time for quantum dynamics simulations.
  • Successfully validated the method on two distinct systems: a spin star with long-range interactions and a spin ladder.
  • The proposed method ensures self-averaging of any observable, simplifying complex calculations.

Conclusions:

  • The developed method offers a significant speedup for simulating quantum evolutions of spin-1/2 systems with local initial excitations.
  • This technique is broadly applicable to ensemble quantum computation and NMR experiments.
  • The use of a single entangled pure state with random phases provides an efficient pathway to study quantum dynamics.