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Related Concept Videos

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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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

Double Resonance Techniques: Overview

173
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

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

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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...
993
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...
648
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

275
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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Updated: May 22, 2025

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional &#960;-conjugate Systems
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RASER for Increased Spectral Resolution in Carbon-13 NMR.

Christopher Nelson1, Andreas B Schmidt2,3,4, Isaiah Adelabu4

  • 1Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States.

Analytical Chemistry
|March 13, 2025
PubMed
Summary
This summary is machine-generated.

Radiofrequency amplification by stimulated emission of radiation (RASER) technology enhances nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI). Carbon-13 RASERs offer 10-fold narrower spectral lines, improving precision in NMR parameter determination.

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Magnetic Resonance Imaging (MRI)
  • Quantum Optics

Background:

  • Transverse relaxation time traditionally limits NMR precision and MRI resolution.
  • Radiofrequency amplification by stimulated emission of radiation (RASER) offers a potential breakthrough.
  • Previous research focused on proton (¹H) RASERs.

Purpose of the Study:

  • To investigate the potential of carbon-13 (¹³C) RASERs for enhancing NMR and MRI.
  • To demonstrate control over ¹³C-RASER systems using magnetic field homogeneity and spin coupling.
  • To assess the fidelity of spin information (J-couplings, chemical shifts) in ¹³C-RASER spectra.

Main Methods:

  • Controlled magnetic field homogeneity via sample geometry adjustments.
  • Manipulated spin coupling networks using proton decoupling pulses.
  • Acquired ¹³C-RASER spectra and compared them to conventional NMR spectra.

Main Results:

  • ¹³C-RASER spectra were obtained with spectral-resonance line widths at least 10-fold narrower than thermal NMR.
  • NMR parameters, such as J-coupling, could be determined with significantly increased precision.
  • ¹³C-RASER systems demonstrated high fidelity in retaining spin information, including J-couplings and chemical shifts.

Conclusions:

  • ¹³C-RASER technology can overcome fundamental limitations in NMR precision and MRI resolution.
  • Control over magnetic field homogeneity and spin coupling networks enables effective use of ¹³C-RASERs.
  • ¹³C-RASERs provide a promising avenue for advanced spectroscopic and imaging applications, preserving crucial spin information.