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17O DNP NMR spectrum of water using direct polarization from trityl. a) Simulation using GIPAW calculated parameters for crystal structure, b) simulation of quadrupolar lineshape, c) experiment on-signal for amorphous sample (64 scans, ~7 minutes) and d) experiment off-signal (6646 scans, ~12 hours). Sample conditions: 60/30/10 (v/v) d8-glycerol/D2O/H2 17O using 35% labeled 17O water and 40 mM trityl.
