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Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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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...
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Nuclear Overhauser Enhancement (NOE)01:07

Nuclear Overhauser Enhancement (NOE)

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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
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Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

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All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not...
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

741
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
741
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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Related Experiment Video

Updated: Aug 25, 2025

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
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Radial spin echo small-angle neutron scattering method: concept and performance.

Elisabeth Kadletz1, Wim G Bouwman1, Catherine Pappas1

  • 1Delft University of Technology, Faculty of Applied Sciences, The Netherlands.

Journal of Applied Crystallography
|October 17, 2022
PubMed
Summary
This summary is machine-generated.

A new Radial Spin Echo Small-Angle Neutron Scattering (SESANS) method uses radial magnetic fields. This technique measures projected correlation functions and can be integrated into existing neutron spin echo spectrometers.

Keywords:
Larmor labellingpolarized neutronssmall-angle neutron scatteringspin echo small-angle neutron scattering

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Area of Science:

  • Neutron scattering physics
  • Materials science instrumentation

Background:

  • Conventional linear Spin Echo Small-Angle Neutron Scattering (SESANS) is a key technique for materials analysis.
  • Neutron Spin Echo (NSE) spectrometers utilize longitudinal precession fields and radial field gradients.

Purpose of the Study:

  • Introduce a novel Radial SESANS concept utilizing a rotationally symmetric magnetic field.
  • Explore the performance and characteristics of the Radial SESANS setup.
  • Compare Radial SESANS with linear SESANS for scattering from solid spheres.

Main Methods:

  • Implementation of longitudinal precession fields and radial field gradients.
  • Utilizing radial shifters (coils) to generate gradients for encoding neutron trajectories.
  • Analyzing neutron scattering data from solid spheres to evaluate performance.

Main Results:

  • Radial SESANS is sensitive to scattering along the radial direction only.
  • The method measures the projected correlation function along the radial direction.
  • Performance evaluation shows comparable results to linear SESANS for specific cases.

Conclusions:

  • Radial SESANS offers a new approach for materials characterization using neutron scattering.
  • The technique can potentially be implemented as an add-on to existing NSE setups.
  • Further development could involve spin echo modulated small-angle neutron scattering with radial magnetic fields.