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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: 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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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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

NMR Spectrometers: Resolution and Error Correction

946
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...
946
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
2.1K
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

782
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Sensitivity-enhanced multiple-quantum MAS NMR for half-integer spin quadrupolar nuclei using WURST-amplitude shaped

Jonas Koppe1, Robert Knitsch1, Sebastian Wegner2

  • 1Institute for Physical Chemistry, Westfälische Wilhelms-Universität, Corrensstr. 28/30, D-48149 Münster, Germany.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|November 22, 2020
PubMed
Summary

New WURST-Amplitude Shaped Pulses (WASPs) enhance solid-state NMR sensitivity for quadrupolar nuclei. These shaped radio-frequency pulses improve coherence transfers, offering better spectral resolution and reduced hardware issues in MQMAS NMR spectroscopy.

Keywords:
Amplitude modulationHalf-integer spin quadrupolar nucleiMASMultiple-quantum NMRShaped pulsesSolid-state NMR

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Quantum Coherence Manipulation
  • Materials Science

Background:

  • Two-dimensional multiple-quantum MAS (MQMAS) NMR is crucial for analyzing quadrupolar nuclei in solid-state materials.
  • Conventional MQMAS techniques often face sensitivity limitations, especially with nutation-driven coherence transfers.
  • High radio-frequency (rf) amplitudes, reaching the rf-limit, are typically required, posing hardware challenges.

Purpose of the Study:

  • To introduce and evaluate WURST-Amplitude Shaped Pulses (WASPs) for improving MQMAS NMR sensitivity and performance.
  • To demonstrate the advantages of WASPs over traditional rectangular rf-pulses in solid-state NMR.
  • To explore the application of WASPs for enhanced excitation of multiple-quantum coherences in quadrupolar nuclei.

Main Methods:

  • Development and theoretical analysis of WASPs with smoothly truncated amplitude profiles.
  • Numerical simulations to assess WASP performance in 3-pulse z-filtered and split-t1 shifted-echo MQMAS sequences.
  • Experimental validation using spin-3/2 and spin-5/2 quadrupolar nuclei.

Main Results:

  • WASPs exhibit superior hardware compatibility, reducing voltage reflections and transient effects compared to rectangular pulses.
  • WASPs demonstrate enhanced potential for nutation-based 3-quantum (3Q) and 5-quantum (5Q) excitation, particularly at high nutation frequencies.
  • The WASP concept was successfully extended to Fast Amplitude Modulation (FAM) pulses for rotor-driven conversions.

Conclusions:

  • WASPs offer a significant advancement for solid-state MQMAS NMR, improving sensitivity and spectral quality.
  • The use of WASPs enables more efficient excitation of multiple-quantum coherences for quadrupolar nuclei.
  • This technique holds promise for pushing the boundaries of solid-state NMR analysis, even with peak rf-amplitudes beyond the conventional rf-limit.