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Related Concept Videos

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...
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...
¹H NMR of Labile Protons: Temporal Resolution01:10

¹H NMR of Labile Protons: Temporal Resolution

Protons bonded to heteroatoms such as nitrogen and oxygen exhibit a range of chemical shift values. This is due to the varying degree of hydrogen bonding between the proton and the heteroatom in other molecules. The extent of hydrogen bonding affects the electron density around the proton, thereby giving different chemical shift values for the protons in the proton NMR spectrum.
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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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Solid state deuteron relaxation time anisotropy measured with multiple echo acquisition.

Robert L Vold1, Gina L Hoatson, Liliya Vugmeyster

  • 1Department of Applied Science, College of William and Mary, Williamsburg, VA 23187-8795, USA. rlvold@wm.edu

Physical Chemistry Chemical Physics : PCCP
|August 5, 2009
PubMed
Summary
This summary is machine-generated.

Recording multiple echoes using quadrupole Carr-Purcell-Meiboom-Gill (QCPMG) or magic angle spinning (MAS) improves solid-state deuteron NMR signal. QCPMG preserves relaxation time anisotropy in sidebands, unlike MAS, requiring explicit simulation for accurate T(1Q) and T(1Z) values.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy
  • Materials characterization
  • Physical chemistry

Background:

  • Improving signal-to-noise ratio (SNR) is crucial for solid-state deuteron NMR.
  • Quadrupolar nuclei present challenges due to their anisotropic interactions.
  • Existing methods like magic angle spinning (MAS) have limitations in preserving relaxation information.

Purpose of the Study:

  • To investigate the impact of multiple-echo techniques on relaxation time measurements in solid-state deuteron NMR.
  • To compare the ability of quadrupole Carr-Purcell-Meiboom-Gill (QCPMG) and MAS to preserve relaxation anisotropy.
  • To establish accurate methods for determining relaxation times of Zeeman and quadrupole order.

Main Methods:

  • Theoretical analysis of relaxation processes in solid-state NMR.
  • Experimental implementation of QCPMG and MAS pulse sequences.
  • Acquisition and analysis of partially relaxed deuteron NMR spectra.
  • Comparison of relaxation times measured on individual sidebands versus powder patterns.

Main Results:

  • Both QCPMG and MAS enhance the SNR of deuteron NMR line shapes.
  • QCPMG experiments on individual sidebands preserve relaxation time anisotropy for T(1Z) and T(1Q).
  • Rotational sidebands in MAS spectra do not preserve relaxation time anisotropy.
  • Relaxation times from QCPMG sidebands differ from quadrupole echo powder patterns and require simulation.

Conclusions:

  • QCPMG is superior to MAS for preserving relaxation anisotropy in partially relaxed deuteron NMR spectra.
  • Accurate determination of relaxation times using QCPMG requires explicit spectral simulation.
  • These findings offer improved methodologies for characterizing dynamic processes in solid materials using NMR.