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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

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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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¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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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.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
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Double Resonance Techniques: Overview01:12

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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 Spectroscopy: Spin–Spin Coupling01:08

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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Carbon-13 (¹³C) NMR: Overview01:10

Carbon-13 (¹³C) NMR: Overview

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Carbon-13 is a naturally occurring NMR-active isotope of carbon with a low natural abundance of 1.1%. In contrast, carbon-12 is the most abundant isotope of carbon with zero nuclear spin. Therefore, it is NMR inactive. The gyromagnetic ratio of carbon-13 is smaller than that of protons. As a result, carbon-13 resonance is about 6000 times weaker than proton resonance. For a given magnetic field strength, the resonance frequency of carbon-13 is about one-fourth of the resonance frequency for...
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Electron Spin Relaxation in Carbon Materials.

Damian Tomaszewski1, Krzysztof Tadyszak1

  • 1Institute of Molecular Physics Polish Academy of Sciences, ul. Mariana Smoluchowskiego 17, 60-179 Poznań, Poland.

Materials (Basel, Switzerland)
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Summary

This study explores electron spin relaxation in diverse carbon materials using Electron Paramagnetic Resonance (EPR) spectroscopy. It details relaxation rates and processes across natural and synthetic carbons, offering a comprehensive overview for researchers.

Keywords:
EPRactivated carbon fibersanthraciteanthraxolitediamondgraphenegraphene oxidephase memory timereduced graphene oxidespin–lattice relaxation timespin–spin relaxation time

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Spectroscopy

Background:

  • Electron spin relaxation is crucial for understanding electron dynamics in materials.
  • Electron Paramagnetic Resonance (EPR) spectroscopy is a powerful tool for probing these dynamics.
  • Carbon materials exhibit diverse electronic properties influenced by their structure.

Purpose of the Study:

  • To review and present Electron Paramagnetic Resonance (EPR) relaxation measurements in a wide array of carbon samples.
  • To elucidate the fundamental processes governing electron spin relaxation in different carbon allotropes.
  • To establish typical ranges of electron spin relaxation rates for various carbon types.

Main Methods:

  • Utilizing Electron Paramagnetic Resonance (EPR) spectroscopy to measure relaxation times.
  • Analyzing relaxation data from both naturally occurring and synthetically produced carbon materials.
  • Comparing relaxation behaviors across diverse carbon structures, including graphite, graphene, and fullerenes.

Main Results:

  • Demonstrated significant variations in electron spin relaxation rates across different carbon forms.
  • Identified key processes contributing to relaxation, such as spin-orbit coupling and interactions with paramagnetic defects.
  • Provided a comprehensive dataset of relaxation rates for natural carbons (anthracite, coal) and synthetic carbons (graphene oxide, nanoribbons, diamonds).

Conclusions:

  • Electron spin relaxation is highly sensitive to the structural and electronic characteristics of carbon materials.
  • EPR relaxation measurements offer valuable insights into electron transport and defect properties in carbons.
  • This review serves as a foundational resource for future research on carbon-based electronic devices and materials.