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Dissolution dynamic nuclear polarization (D-DNP) experiments can show unexpected spectral features due to magnetic field changes. These features arise from long-lived states formed during adiabatic field cycling, impacting nuclear spin behavior.

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Area of Science:

  • Nuclear Magnetic Resonance Spectroscopy
  • Quantum Dynamics
  • Physical Chemistry

Background:

  • Dissolution dynamic nuclear polarization (D-DNP) involves sample transfer between high-field magnets.
  • Sample transfer can expose spins to weak or reversing magnetic fields, similar to field-cycling NMR.
  • Such field variations can induce complex spectral features in spin systems.

Purpose of the Study:

  • To explain the spectral features observed in D-DNP experiments during magnetic field transfer.
  • To investigate the role of adiabaticity in spin Hamiltonian evolution.
  • To understand the formation and impact of long-lived states in D-DNP.

Main Methods:

  • Analysis of spin Hamiltonian time-dependence during magnetic field cycling.
  • Theoretical modeling of spin systems undergoing transitions between weak and strong coupling regimes.
  • Investigation of adiabatic passage through low magnetic fields.

Main Results:

  • Spectral features in D-DNP can be explained by adiabatic field cycling.
  • Passage through low fields can create a long-lived state (LLS) from singlet-triplet population imbalance.
  • The LLS leads to anti-phase multiplet components in observed NMR signals.

Conclusions:

  • Adiabatic conditions rationalize spectral anomalies in D-DNP.
  • Long-lived states are a key phenomenon arising from field cycling in D-DNP.
  • Understanding LLS formation is crucial for interpreting D-DNP NMR spectra.