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Related Concept Videos

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...
245
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Nuclear Overhauser Enhancement (NOE)01:07

Nuclear Overhauser Enhancement (NOE)

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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

685
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...
685
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

677
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.
677
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

1.0K
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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Updated: Jul 20, 2025

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
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Resonant Mixing Dynamic Nuclear Polarization.

Yifan Quan1, Yifu Ouyang1, Michael Mardini1

  • 1Francis Bitter Magnet Laboratory and Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.

The Journal of Physical Chemistry Letters
|July 31, 2023
PubMed
Summary
This summary is machine-generated.

We introduce Resonant Mixing (RM), a novel dynamic nuclear polarization mechanism distinct from established effects. RM occurs under on-resonance microwave irradiation, differing from the off-resonance conditions optimal for the solid effect.

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Area of Science:

  • Magnetic Resonance
  • Quantum Mechanics
  • Chemical Physics

Background:

  • Dynamic nuclear polarization (DNP) enhances NMR sensitivity.
  • Existing DNP mechanisms include the Overhauser effect, solid effect, cross effect, and thermal mixing.
  • The solid effect is optimal under off-resonance microwave irradiation.

Purpose of the Study:

  • To propose and describe a new DNP mechanism, termed Resonant Mixing (RM).
  • To differentiate RM from existing DNP processes.
  • To explain the dispersive-shaped DNP field profile observed in trityl samples.

Main Methods:

  • Analysis of density matrix evolution for an electron-nucleus coupled spin pair.
  • Investigation of spin dynamics under weak microwave irradiation.
  • Comparison of RM with the solid effect under varying microwave field conditions.

Main Results:

  • Resonant Mixing (RM) is identified as a distinct DNP mechanism.
  • RM is optimal under on-resonance microwave irradiation.
  • RM involves state mixing driven by the microwave field and electron-nuclear coupling.

Conclusions:

  • RM provides an alternative explanation for DNP phenomena.
  • The proposed RM mechanism accounts for the dispersive DNP field profile in trityl samples.
  • This finding expands the understanding of DNP mechanisms and their applications.