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Related Concept Videos

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...
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Carbon-13 (¹³C) NMR: Overview01:10

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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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Atomic Nuclei: Magnetic Resonance01:05

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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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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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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Related Experiment Video

Updated: Jun 21, 2025

High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
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Solid-State NMR 13C sensitivity at high magnetic field.

Ruixian Han1, Collin G Borcik2, Songlin Wang3

  • 1Department of Chemistry, University of Wisconsin-Madison, Madison, WI, United States.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|July 11, 2024
PubMed
Summary
This summary is machine-generated.

Higher magnetic fields in Nuclear Magnetic Resonance (NMR) experiments boost signal-to-noise ratio (SNR). This study quantifies SNR gains with probe design and magnetic field strength (B0), finding optimal configurations for raw and mass-limited sensitivity.

Keywords:
(13)C detectionHigh magnetic fieldMAS SSNMRProbe designSensitivity

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Analytical Chemistry
  • Materials Science

Background:

  • Sensitivity is paramount in Nuclear Magnetic Resonance (NMR) experiments.
  • Signal-to-noise ratio (SNR) is expected to increase with static magnetic field (B0).
  • Understanding probe design and B0 dependence is crucial for maximizing SNR.

Purpose of the Study:

  • To systematically investigate 13C SNR under magic-angle spinning (MAS) across a range of magnetic fields (14.1 to 21.1 T).
  • To evaluate the impact of different NMR probe designs and rotor sizes on SNR.
  • To establish quantitative relationships between B0, probe characteristics, and SNR.

Main Methods:

  • Conducted 24 measurement sets across 17 probe configurations using five spectrometers.
  • Employed N-acetyl valine as the primary standard, with comparisons to adamantane, glycine, hexamethylbenzene, and 3-methylglutaric acid.
  • Systematically varied rotor sizes (1.6, 2.5, and 3.2 mm) and magnetic field strengths.

Main Results:

  • Optimal raw SNR was achieved with a balanced 3.2 mm probe design at 17.6 T.
  • The best mass-limited SNR was obtained using a balanced 1.6 mm probe design at 21.1 T.
  • At 21.1 T, increasing rotor size beyond 2.5 mm showed diminishing returns for raw SNR.

Conclusions:

  • The study provides a comprehensive understanding of SNR contributions from probe efficiency, receiver noise, and B0 dependence.
  • Specific probe designs and rotor sizes are optimal for different SNR metrics (raw vs. mass-limited) at high magnetic fields.
  • These findings guide the selection and optimization of NMR probes for enhanced sensitivity in high-field NMR.