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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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...
Gyroscope: Precession01:24

Gyroscope: Precession

Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
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...
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 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...
Gyroscope01:02

Gyroscope

A gyroscope is defined as a spinning disk in which the axis of rotation is free to assume any orientation. When spinning, the orientation of the spin axis is unaffected by the orientation of the body that encloses it. The body or vehicle enclosing the gyroscope can be moved from place to place, while the orientation of the spin axis remains the same. This makes gyroscopes very useful in navigation, especially where magnetic compasses cannot be used, such as in crewed and crewless spacecraft,...

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Related Experiment Video

Updated: May 21, 2026

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
10:02

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions

Published on: May 27, 2021

Spin-orbit echo.

N Sugimoto1, N Nagaosa

  • 1Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan.

Science (New York, N.Y.)
|June 16, 2012
PubMed
Summary
This summary is machine-generated.

Spin information is preserved by a conserved "twisted spin" that survives scattering. A predicted spin-orbit echo phenomenon demonstrates spin recovery even after relaxation, confirmed by simulations.

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Echo Particle Image Velocimetry
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Echo Particle Image Velocimetry

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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

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Last Updated: May 21, 2026

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
10:02

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Published on: May 27, 2021

Echo Particle Image Velocimetry
16:31

Echo Particle Image Velocimetry

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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

Published on: June 28, 2018

Area of Science:

  • Spintronics
  • Quantum Information Science
  • Condensed Matter Physics

Background:

  • Preserving quantum spin information is crucial for spintronics.
  • Spin-orbit interaction (SOI) in solids limits spin lifetime.
  • Disorder scattering typically degrades spin coherence.

Purpose of the Study:

  • To investigate mechanisms for preserving spin information in solids.
  • To explore the role of conserved quantities in spin dynamics.
  • To predict and verify novel spin phenomena.

Main Methods:

  • Theoretical analysis of spin dynamics under spin-orbit interaction.
  • Identification of a hidden conserved quantity: "twisted spin".
  • Numerical simulations to confirm predicted phenomena.

Main Results:

  • Spin information is preserved by the "twisted spin", an adiabatic invariant.
  • This conserved spin survives elastic disorder scattering.
  • A "spin-orbit echo" phenomenon is predicted and numerically confirmed.

Conclusions:

  • The "twisted spin" offers a pathway to robust spin information preservation.
  • The spin-orbit echo demonstrates the potential for spin recovery post-relaxation.
  • Experimental verification in 2D semiconductor quantum wells is proposed.