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Mass Analyzers: Common Types01:19

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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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.
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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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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...
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The unit rectangular pulse function is mathematically represented by a rectangular function centered at the origin with a height of one unit. This function is defined by two parameters: T, which specifies the center location of the pulse along the time axis, and τ, which determines the pulse duration.
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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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Quadrupole sensitive pulse for signal filtering.

Nimerovsky Evgeny1, Alexej Jerschow1

  • 1Department of Chemistry, New York University, New York, NY 10003, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|February 25, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method for selective excitation in quadrupolar Nuclear Magnetic Resonance (NMR) of spin-3/2 nuclei. This technique overcomes limitations of existing methods, enabling signal selection even with low radio frequency power.

Keywords:
Na NMRQuadrupolar couplingQuadrupole selective pulseTissueWeak radio frequency fields

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Solid-State Chemistry
  • Biophysics

Background:

  • Quadrupolar Nuclear Magnetic Resonance (NMR) of semi-solids faces challenges in selecting signals from ordered nuclei with non-vanishing quadrupolar coupling.
  • Existing techniques like multiple-quantum filters are inadequate when radio frequency power approaches quadrupolar coupling or relaxation rates, common in MRI and ex situ applications.

Purpose of the Study:

  • To develop and validate a new method for the selective excitation of ordered spin-3/2 nuclei.
  • To enable signal selection in quadrupolar NMR under conditions where conventional methods fail, specifically with radio frequency power comparable to or less than the quadrupolar frequency.

Main Methods:

  • Development of a novel selective excitation technique for quadrupolar spin-3/2 nuclei.
  • Validation through a combination of theoretical simulations and experimental studies.
  • Experiments conducted using Sodium-23 ((23)Na) in NaCl solution, Pf1-solutions, and bovine patellar cartilage samples.

Main Results:

  • The new method successfully achieves selective excitation of ordered spin-3/2 nuclei, even with radio frequency power approximately equal to or smaller than the quadrupolar frequency.
  • Demonstrated ability to extract the quadrupolar frequency value from experimental data.
  • Showcased the extraction of global features of the quadrupolar coupling distribution.

Conclusions:

  • The developed method offers a significant advancement for quadrupolar NMR in semi-solids, particularly in challenging experimental regimes.
  • This technique enhances the capability to study ordered nuclei in systems relevant to Magnetic Resonance Imaging (MRI) and ex situ analyses.
  • Provides a pathway for detailed characterization of quadrupolar interactions and their distributions in complex samples.