Nicholas N. Kuzma1, Huseyin Kara, 12, Mehrdad Pourfathi1, Philip Manasseh3, Rajat K. Ghosh1, Stephen J. Kadlecek1, Giuseppe Pileio4, Pr Hkansson4, Malcolm H. Levitt4, Rahim R. Rizi1
1Radiology, University of Pennsylvania, Philadelphia, PA, United States; 2Astronomy and Physics, University of Pennsylvania, Philadelphia, PA, United States; 3Department of Chemistry, Earlham College, Richmond, IN, United States; 4School of Chemistry, Southampton University, Southampton, Hempshire, United Kingdom
This is the first report of dynamic nuclear polarization (DNP) of doubly-labeled 15N2O. Sample polarization during DNP at 1.5 K and 5 T was monitored in-situ by solid-state NMR as a function of microwave frequency in the range 140.04 - 140.16 GHz. The fastest initial polarization rate occurred at 140.063 and 140.130 GHz microwave frequencies, corresponding to positive and negative polarizations of the nuclear spin system. Polarization levels of (114)% were achieved in the frozen sample.