4.4 Article

Field-cycling long-lived-state NMR of 15N2 spin pairs

Journal

MOLECULAR PHYSICS
Volume 117, Issue 7-8, Pages 861-867

Publisher

TAYLOR & FRANCIS LTD
DOI: 10.1080/00268976.2018.1543906

Keywords

Long-lived states; N-15(2) spin pair; field-cycling; two-field NMR spectrometer

Funding

  1. Engineering and Physical Sciences Research Council (EPSRC) UK [EP/N002482, EP/L505067/1]
  2. European ResearchCouncil (ERC) under the European Communities Seventh Framework Programme (FP7/2007-2013) [279519]
  3. Wolfson Foundation
  4. COST STSM Action [CA15209]
  5. Bruker BioSpin UK
  6. European Research Council (ERC) [279519] Funding Source: European Research Council (ERC)
  7. EPSRC [EP/P009980/1, EP/K00509X/1, EP/P030491/1] Funding Source: UKRI

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A range of nuclear magnetic resonance spectroscopy and imaging applications are limited by the short lifetimes of magnetisation in solution. Long-lived states, which are slowly relaxing configurations of nuclear spins, have been shown to alleviate this limitation. Long-lived states have decay lifetimes significantly exceeding the longitudinal relaxation time , in some cases by an order of magnitude. Here we present an experimental case of a long-lived state for a N-15 labelled molecular system in solution. We observe a strongly biexponential decay for the long-lived state, with the lifetime of the slowly relaxing component exceeding 40 minutes, similar to 21 times longer than the spin-lattice relaxation time . The lifetime of the long-lived state was revealed by using a dedicated two-field NMR spectrometer capable of fast sample shuttling between high and low magnetic fields, and the application of a resonant radiofrequency field at low magnetic field. The relaxation characteristics of the long-lived state are examined.

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