Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

283
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...
283
NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

902
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.
902
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

746
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...
746
NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

769
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...
769
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

1.2K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.2K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.1K
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...
1.1K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same authorSame journal

<sup>75</sup>As NQR characterisation of cobaltite (CoAsS).

Solid state nuclear magnetic resonance·2026
Same author

Epidural Spinal Cord Stimulation for Spinal Cord Injury in Humans: A Systematic Review.

Journal of clinical medicine·2024
Same author

Expression of IFN-λ1 from Congjiang pigs and its effect on anti-PRRSV proliferation.

Polish journal of veterinary sciences·2020
Same author

(121,123)Sb and (75)As NMR and NQR investigation of the tetrahedrite (Cu12Sb4S13)--Tennantite (Cu12As4S13) system and other metal arsenides.

Solid state nuclear magnetic resonance·2015
Same author

(75)As NQR studies on FeAs2.

Solid state nuclear magnetic resonance·2015
Same author

Nanoscratch testing for the assessment of enamel demineralization under conditions simulating wine erosion.

Australian dental journal·2015

Related Experiment Video

Updated: Sep 4, 2025

High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
08:42

High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions

Published on: October 10, 2014

11.7K

Long single pulse NQR for broad resonance lines.

T C L Ly1, R Yong1, D G Miljak1

  • 1Commonwealth Scientific and Industrial Research Organisation (CSIRO), Mineral Resources, New Illawarra Rd, Lucas Heights, New South Wales, 2234, Australia.

Solid State Nuclear Magnetic Resonance
|July 14, 2022
PubMed
Summary

This study demonstrates effective signal generation using long radiofrequency pulses in Nuclear Quadrupole Resonance (NQR) spectroscopy, even with broadened spectral lines. This technique is crucial for large-volume applications facing radiofrequency power constraints.

Keywords:
Copper sulfidesLong pulsesNuclear quadrupole resonanceSingle pulses

More Related Videos

Author Spotlight: Exploring Intrinsically Disordered Protein Dynamics Through NMR Relaxation Experiments
09:25

Author Spotlight: Exploring Intrinsically Disordered Protein Dynamics Through NMR Relaxation Experiments

Published on: November 1, 2024

2.1K
High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
10:40

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

7.6K

Related Experiment Videos

Last Updated: Sep 4, 2025

High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
08:42

High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions

Published on: October 10, 2014

11.7K
Author Spotlight: Exploring Intrinsically Disordered Protein Dynamics Through NMR Relaxation Experiments
09:25

Author Spotlight: Exploring Intrinsically Disordered Protein Dynamics Through NMR Relaxation Experiments

Published on: November 1, 2024

2.1K
High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
10:40

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

7.6K

Area of Science:

  • Solid-state physics
  • Materials science
  • Spectroscopy

Background:

  • Nuclear Quadrupole Resonance (NQR) spectroscopy is sensitive to local electronic environments in solids.
  • Strongly inhomogeneously broadened NQR lines pose challenges for traditional pulse techniques.
  • Previous studies have not fully explored long pulse regimes for such broadened lines.

Purpose of the Study:

  • To experimentally investigate the application of long single radiofrequency pulses to strongly inhomogeneously broadened NQR lines.
  • To assess the feasibility of this technique for large-volume applications with limited radiofrequency power.
  • To understand signal generation dynamics in this specific NQR regime.

Main Methods:

  • Experimental application of long single radiofrequency pulses (pulse length >> transverse relaxation time).
  • Study of 63Cu NQR resonance in covellite (CuS) as an exemplar.
  • Measurement of signal transients across a range of radiofrequency field strengths and pulse widths.
  • Comparison with simulations of modified Bloch equations.

Main Results:

  • Effective generation of signal amplitudes was achieved using long single pulses.
  • Observed signal behavior contrasts with previous findings on narrower resonances.
  • Experimental results are well-reproduced by modified Bloch equation simulations.

Conclusions:

  • Long single pulses are effective for generating signals in strongly inhomogeneously broadened NQR lines.
  • This method shows promise for NQR applications in large volumes under power limitations.
  • The modified Bloch equations accurately model the observed phenomena in this regime.