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Related Concept Videos

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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...
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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...
Nuclear Overhauser Enhancement (NOE)01:06

Nuclear Overhauser Enhancement (NOE)

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...
Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers energy to a nearby...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis. This...

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Related Experiment Video

Updated: Jul 4, 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

Nuclear quadrupole resonance single-pulse echoes.

David W Prescott1, Joel B Miller, Chris Tourigny

  • 1Department of Physics and Astronomy, George Mason University, 4400 University Drive MS 3F3, Fairfax, VA 22030, USA. dprescot@gmu.edu

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|June 24, 2008
PubMed
Summary
This summary is machine-generated.

Researchers detected a spin echo using a single pulse in nuclear quadrupole resonance (NQR) spectroscopy. This advance enhances signal detection for quadrupole nuclei, aiding in identifying substances like RDX.

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Last Updated: Jul 4, 2026

Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
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Published on: May 27, 2021

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08:01

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Published on: September 26, 2016

Area of Science:

  • Physics
  • Chemistry
  • Spectroscopy

Background:

  • Nuclear Quadrupole Resonance (NQR) spectroscopy is a powerful technique for material analysis.
  • Inhomogeneously broadened lines in NQR spectra, often due to electric field gradient distributions, present detection challenges.

Purpose of the Study:

  • To report the first detection of a spin echo using a single excitation pulse in NQR.
  • To explore the conditions and potential applications of this single-pulse spin echo phenomenon.

Main Methods:

  • Utilizing a single radio-frequency pulse at the resonance frequency to excite a powder sample.
  • Investigating the influence of Rabi frequency relative to linewidth and effective tipping angle (approx. 270 degrees) on echo formation.
  • Demonstrating the technique with glycine hemihydrochloride and hexhydro-1,3,5-trinitro-1,3,5-triazine (RDX).

Main Results:

  • Successfully detected a spin echo following single-pulse excitation in NQR.
  • Observed that echo detectability is enhanced when Rabi frequency approaches linewidth and tipping angle is near 270 degrees.
  • Showcased the potential for increased signal-to-noise ratio compared to conventional methods, especially under weak radio-frequency field limitations.

Conclusions:

  • Single-pulse spin echoes are achievable in NQR for inhomogeneously broadened lines.
  • This technique offers a method to improve signal detection sensitivity.
  • The findings can optimize NQR for detecting contraband materials containing quadrupole nuclei.