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• W2033082689 abstract "During dynamic nuclear polarization (DNP) at 1.5 K and 5 T, 129Xe nuclear magnetic resonance (NMR) spectra of a homogeneous xenon/1-propanol/trityl-radical solid mixture exhibit a single peak, broadened by 1H neighbors. A second peak appears upon annealing for several hours at 125 K. Its characteristic width and chemical shift indicate the presence of spontaneously formed pure Xe clusters. Microwave irradiation at the appropriate frequencies can bring both peaks to either positive or negative polarization. The peculiar time evolution of 129Xe polarization in pure Xe clusters during DNP can be modelled as an interplay of spin diffusion and T1 relaxation. Our simple spherical-cluster model offers a sensitive tool to evaluate major DNP parameters in situ, revealing a severe spin-diffusion bottleneck at the cluster boundaries and a significant sample overheating due to microwave irradiation. Subsequent DNP system modifications designed to reduce the overheating resulted in four-fold increase of 129Xe polarization, from 5.3% to 21%." @default.
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• W2033082689 date "2012-09-13" @default.
• W2033082689 modified "2023-10-18" @default.
• W2033082689 title "Cluster formation restricts dynamic nuclear polarization of xenon in solid mixtures" @default.
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• W2033082689 doi "https://doi.org/10.1063/1.4751021" @default.
• W2033082689 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3460970" @default.
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• W2033082689 hasPublicationYear "2012" @default.
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