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Related Concept Videos

Nuclear Overhauser Enhancement (NOE)01:06

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 spin-active...
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Atomic Nuclei: Nuclear Spin State Overview01:03

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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 one, the...
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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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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 contribute to...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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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...
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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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Related Experiment Video

Updated: Mar 30, 2026

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
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Quantitative Neutron Dark-field Imaging through Spin-Echo Interferometry.

Markus Strobl1,2, Morten Sales2,3, Jeroen Plomp4

  • 1European Spallation Source AB, Lund 22100, Sweden.

Scientific Reports
|November 13, 2015
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Summary

Neutron dark-field imaging now offers quantitative microstructural analysis. A new spin-echo technique enables precise measurements, bridging macroscopic and microscopic structural scales.

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

  • Neutron imaging and materials science.

Background:

  • Neutron dark-field imaging combines real-space resolution with small-angle neutron scattering (SANS) for structural characterization.
  • Grating interferometers have enabled mapping of SANS signals to probe microstructures, but quantification is limited by monochromatic approaches.

Purpose of the Study:

  • To introduce a novel, flexible method for quantitative dark-field neutron imaging.
  • To overcome limitations in the small-angle scattering regime by enabling quantitative microstructural characterization.

Main Methods:

  • Development of an alternative interferometric beam modulation technique using spin-echo.
  • Application of the spin-echo technique to achieve quantitative dark-field neutron imaging.

Main Results:

  • The novel spin-echo method facilitates straightforward quantitative dark-field neutron imaging.
  • Enables simultaneous acquisition of quantitative microstructural reciprocal space information (from SANS) and macroscopic image information.

Conclusions:

  • This new method provides quantitative microstructural characterization with real-space resolution.
  • It allows for the quantification of structure sizes across several orders of magnitude simultaneously, advancing neutron imaging capabilities.