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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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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.
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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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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.
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Area of Science:

  • Quantum physics
  • Statistical mechanics
  • Condensed matter physics

Background:

  • Understanding quantum many-body thermalization is a key challenge.
  • Microscopic spin dynamics in disordered systems are not fully understood.

Purpose of the Study:

  • To experimentally investigate individual spin dynamics in a 2D electron spin ensemble on a diamond surface.
  • To probe correlation dynamics and understand anomalous relaxation rates.

Main Methods:

  • Utilized a near-surface nitrogen-vacancy (NV) center as a nanoscale magnetic sensor.
  • Probed individual spin dynamics in a dipolar interacting surface spin ensemble.
  • Employed resonant spin-lock driving to control local magnetic fields.

Main Results:

  • Observed significantly slower spin relaxation rates than predicted by nearest-neighbor interactions.
  • Found relaxation rates strongly correlated with local magnetic field fluctuation timescales.
  • Attributed anomalous relaxation to strong dynamical disorder, explained by dynamic resonance counting.

Conclusions:

  • Dynamical disorder significantly impacts spin relaxation in these systems.
  • Resonant spin-lock driving offers a method to control effective magnetic fields and study disorder effects.
  • This work provides a foundation for microscopic study and control of quantum thermalization in disordered spin ensembles.