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Dynamic nuclear polarization (DNP) can provide large signal enhancements in nuclear magnetic resonance (NMR) by transfer of polarization from electron spins to nuclear spins. We discuss several aspects of DNP experiments at 9.4T (400MHz resonant frequency for 1 H, 264GHz for electron spins in organic radicals) in the 7–80K temperature range, using a 30mW, frequency-tunable microwave source...
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