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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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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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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

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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.
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¹³C NMR: ¹H–¹³C Decoupling01:04

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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.
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NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

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NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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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...
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Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
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Electron-paramagnetic resonance detection with software time locking.

Giovanni Aloisi1, Matteo Mannini1, Andrea Caneschi1

  • 1Department of Chemistry and INSTM Research Unit, University of Florence, Via della Lastruccia 3, 50019 Sesto Fiorentino (FI), Italy.

The Review of Scientific Instruments
|March 6, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces a novel electron paramagnetic resonance setup using digital detection and a reference tone to lock resonance signals without hardware time synchronization. This method enhances signal stability and accuracy for precise measurements.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Physical Chemistry

Background:

  • Electron paramagnetic resonance (EPR) spectroscopy is a powerful technique for studying materials with unpaired electrons.
  • Traditional EPR setups often require complex hardware time locking for signal stability.
  • Narrow band digital detection offers potential for improved sensitivity and data processing.

Purpose of the Study:

  • To describe a new setup for electron paramagnetic resonance (EPR) spectroscopy.
  • To implement narrow band digital detection for enhanced signal processing.
  • To achieve resonance signal locking without hardware time synchronization.

Main Methods:

  • A novel EPR setup incorporating narrow band digital detection was developed.
  • A low-frequency reference tone was added to the radio frequency (RF) signal.
  • Digital detection of the reference signal enabled locking of the resonance signal.

Main Results:

  • The described method successfully locked the resonance signal.
  • Locking was achieved even without hardware time locking between RF generator, local oscillators, and sampling stage.
  • The system demonstrated reliable performance with 2,2-Diphenyl-1-Pycryl-Hydrazil (DPPH).

Conclusions:

  • The developed EPR setup with digital detection and reference tone locking provides a robust alternative to traditional methods.
  • This approach simplifies experimental requirements by eliminating the need for strict hardware time synchronization.
  • The technique shows promise for various applications in chemical and physical sciences requiring precise EPR measurements.