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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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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.
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Related Experiment Video

Updated: Aug 27, 2025

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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Nuclear magnetic resonance diffraction with subangstrom precision.

Holger Haas1,2, Sahand Tabatabaei1,2, William Rose3

  • 1Department of Physics and Astronomy, University of Waterloo, Waterloo, ON N2L3G1, Canada.

Proceedings of the National Academy of Sciences of the United States of America
|September 26, 2022
PubMed
Summary
This summary is machine-generated.

Researchers achieved angstrom-scale precision using Nuclear Magnetic Resonance diffraction (NMRd) to study spin structures in indium-phosphide nanowires. This advanced technique offers new possibilities for analyzing nanocrystalline materials.

Keywords:
MRImagnetic resonancescattering

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Nuclear Magnetic Resonance (NMR) is a powerful spectroscopic technique.
  • NMR diffraction (NMRd) was proposed for studying periodic spin arrangements.
  • High-precision spin control and detection are crucial for nanoscale applications.

Purpose of the Study:

  • To achieve Nuclear Magnetic Resonance diffraction (NMRd) measurements with subangstrom precision.
  • To demonstrate the capability of NMRd for probing spin structures in indium-phosphide (InP) nanowires.
  • To extend the Fourier-encoding capabilities of NMR to the angstrom scale.

Main Methods:

  • Combined ultrasensitive force-based spin detection with high-fidelity spin control.
  • Performed NMRd measurements on approximately 2 million 31P spins in an InP nanowire.
  • Executed two experiments: one encoding nanometer-scale magnetization modulation and another using an interferometric technique for displacement detection.

Main Results:

  • Achieved subangstrom precision in NMRd detection.
  • Successfully encoded and detected nanometer-scale spin magnetization modulation with <0.8 Å precision.
  • Demonstrated angstrom-scale sample displacement detection with 0.07 Å precision using an NMRd-based interferometric technique.

Conclusions:

  • The developed diffraction-based techniques extend NMR's Fourier-encoding capabilities to the angstrom scale.
  • NMRd shows significant potential as a tool for analyzing the structure and dynamics of nanocrystalline materials.
  • This work paves the way for advanced nanoscale structural analysis using NMR.