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Related Concept Videos

Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

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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...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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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...
751
Other Nuclides: 31P, 19F, 15N NMR01:16

Other Nuclides: 31P, 19F, 15N NMR

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Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a...
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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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2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

266
Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...
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Assessment of Boron Doped Diamond Electrode Quality and Application to In Situ Modification of Local pH by Water Electrolysis
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Relaxometry with Nitrogen Vacancy (NV) Centers in Diamond.

Aldona Mzyk1,2, Alina Sigaeva1, Romana Schirhagl1

  • 1Groningen University, University Medical Center Groningen, Antonius Deusinglaan 1, 9713AW Groningen, the Netherlands.

Accounts of Chemical Research
|December 8, 2022
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Summary

Relaxometry uses diamond nitrogen-vacancy (NV) centers to detect magnetic noise with nanoscale resolution. This sensitive technique offers high-precision measurements for various applications in physics, chemistry, and biology.

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Area of Science:

  • Quantum sensing
  • Materials science
  • Nanotechnology

Background:

  • Nitrogen-vacancy (NV) centers in diamond act as sensitive quantum sensors.
  • NV centers convert magnetic noise into optical signals, enabling high-sensitivity measurements.
  • Relaxometry leverages NV centers for nanoscale detection of paramagnetic species, analogous to MRI.

Approach:

  • NV center spin polarization via laser pulses followed by relaxation monitoring.
  • T1 relaxation measurements using microwave pulses and varying magnetic fields (cross-relaxometry).
  • Adaptable techniques include scanning magnetometry and measurements in bulk diamond or nanodiamonds.

Key Points:

  • Achieves subcellular and organelle-specific resolution.
  • Detects paramagnetic species concentrations and magnetic field variations.
  • Responsive coatings enable sensitivity to pH, temperature, and electric fields.

Conclusions:

  • Relaxometry is a versatile, low-cost technique with broad applications.
  • Current research often demonstrates proof-of-principle, with significant untapped potential.
  • Further development is encouraged to explore the full capabilities of relaxometry.