Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 21, Issue 25, Pages 13696-13705Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9cp02600b
Keywords
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Funding
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Dilute para-water) [339754]
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (HP4all) [714519]
- Russian Science Foundation [19-43-04116]
- Russian Science Foundation [19-43-04116] Funding Source: Russian Science Foundation
- European Research Council (ERC) [714519] Funding Source: European Research Council (ERC)
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Dissolution dynamic nuclear polarization (D-DNP) experiments rely on the transfer of a sample between two high-field magnets. During this transfer, samples might experience passage through regions where the stray fields of the magnets are very weak, can approach zero, and even change their sign. This can lead to unexpected spectral features in spin systems that undergo transitions from weak- to strong-coupling regimes and vice versa, much like in field cycling nuclear magnetic resonance experiments. We herein demonstrate that the spectral features observed in D-DNP experiments can be rationalized, provided the time-dependence of the spin Hamiltonian upon field cycling is sufficiently adiabatic. Under such conditions, a passage through a weak static field can lead to the emergence of a long-lived state (LLS) based on an imbalance between the populations of singlet and triplet states in pairs of nuclei that are strongly coupled during the passage through low field. The LLS entails the appearance of anti-phase multiplet components upon transfer to a high-field magnet for observation of NMR signals.
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