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Fast-field-cycling ultralow-field nuclear magnetic relaxation dispersion

Author

Listed:
  • Sven Bodenstedt

    (The Barcelona Institute of Science and Technology)

  • Morgan W. Mitchell

    (The Barcelona Institute of Science and Technology
    ICREA – Institució Catalana de Recerca i Estudis Avançats)

  • Michael C. D. Tayler

    (The Barcelona Institute of Science and Technology)

Abstract

Optically pumped magnetometers (OPMs) based on alkali-atom vapors are ultra-sensitive devices for dc and low-frequency ac magnetic measurements. Here, in combination with fast-field-cycling hardware and high-resolution spectroscopic detection, we demonstrate applicability of OPMs in quantifying nuclear magnetic relaxation phenomena. Relaxation rate dispersion across the nT to mT field range enables quantitative investigation of extremely slow molecular motion correlations in the liquid state, with time constants > 1 ms, and insight into the corresponding relaxation mechanisms. The 10-20 fT/ $$\sqrt{{\rm{H}}}{\rm{z}}$$ H z sensitivity of an OPM between 10 Hz and 5.5 kHz 1H Larmor frequency suffices to detect magnetic resonance signals from ~ 0.1 mL liquid volumes imbibed in simple mesoporous materials, or inside metal tubing, following nuclear spin prepolarization adjacent to the OPM. High-resolution spectroscopic detection can resolve inter-nucleus spin-spin couplings, further widening the scope of application to chemical systems. Expected limits of the technique regarding measurement of relaxation rates above 100 s−1 are discussed.

Suggested Citation

  • Sven Bodenstedt & Morgan W. Mitchell & Michael C. D. Tayler, 2021. "Fast-field-cycling ultralow-field nuclear magnetic relaxation dispersion," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-24248-9
    DOI: 10.1038/s41467-021-24248-9
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