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• W2023843731 abstract "Hyperpolarization of nuclear spins is gaining increasing interest as a tool for improving the signal-to-noise ratio of NMR and MRI. While in principle, hyperpolarized samples are amenable to the same or similar experiments as are used in conventional NMR, the large spin polarization may give rise to unexpected effects. Here, spontaneous emission of signal was observed from proton spin systems, which were hyperpolarized to negative spin temperature by dynamic nuclear polarization (DNP). An unexpected feature of these emissions is that, without any radio-frequency excitation, multiple beats arise that cannot be explained by the Bloch equations with radiation damping. However, we show that a simple modification to these equations, which takes into account an additional supply of hyperpolarized magnetization from a reservoir outside of the active detection region, can phenomenologically describe the observed signal. The observed effect demonstrates that even well-known mechanisms of spin evolution can give rise to unexpected effects when working with hyperpolarized samples, which may need to be addressed through the development of new experimental techniques." @default.
• W2023843731 created "2016-06-24" @default.
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• W2023843731 date "2011-02-01" @default.
• W2023843731 modified "2023-10-02" @default.
• W2023843731 title "Spontaneous emission of NMR signals in hyperpolarized proton spin systems" @default.
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• W2023843731 doi "https://doi.org/10.1016/j.jmr.2010.11.002" @default.
• W2023843731 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21145766" @default.
• W2023843731 hasPublicationYear "2011" @default.
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