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Related Concept Videos

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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NMR Spectrometers: Resolution and Error Correction01:14

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

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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 Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

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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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Related Experiment Video

Updated: Dec 26, 2025

Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
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Resolving Dirac electrons with broadband high-resolution NMR.

Wassilios Papawassiliou1, Aleksander Jaworski1, Andrew J Pell2

  • 1Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, Svante Arrhenius vag 16C, SE-106 91, Stockholm, Sweden.

Nature Communications
|March 11, 2020
PubMed
Summary
This summary is machine-generated.

Researchers detected invisible NMR signals in Topological Insulators (TIs) using 125Te NMR. This reveals how Dirac electrons spread within TI nanoplatelets, aiding the study of quantum properties.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Phenomena

Background:

  • Detecting metallic Dirac electronic states on Topological Insulator (TI) surfaces is crucial for understanding surface quantum properties (SQPs).
  • Existing experimental methods lack atomic resolution for visualizing Dirac electron interactions within nanoscaled TI systems.
  • Simultaneous probing of bulk and edge electron states is required for studying phenomena like Majorana zero modes.

Purpose of the Study:

  • To develop and apply an experimental method for atomic-resolution detection of Dirac electrons in TI nanoplatelets.
  • To investigate the spatial distribution and magnetic shielding effects of Dirac electrons within Bi2Te3.
  • To enable simultaneous measurement of bulk and edge electron states for SQP studies.

Main Methods:

  • Utilized advanced broadband solid-state 125Te nuclear magnetic resonance (NMR) techniques.
  • Applied NMR to bismuth telluride (Bi2Te3) nanoplatelets.
  • Analyzed NMR signals to probe magnetic shielding influenced by Dirac electrons.

Main Results:

  • Successfully uncovered previously undetected NMR signals in Bi2Te3 nanoplatelets.
  • Demonstrated that these signals are influenced by the magnetic shielding of Dirac electrons.
  • Showcased the spatial extent of Dirac electrons within the nanoplatelets at atomic scale resolution.

Conclusions:

  • The 125Te NMR method provides a novel approach to study Dirac electrons in TIs.
  • Simultaneous measurement of spin and orbital magnetic susceptibilities from bulk and edge states is now feasible.
  • This technique offers a pertinent experimental pathway for advancing the study of SQPs and related phenomena.