Dynamic nuclear polarization transfers spin polarization from electrons to nuclei. We have achieved this by a new method, simultaneously exciting transitions of electronic and nuclear spins. The efficiency of this technique improves with increasing magnetic field. Experimental results are shown for N@C60 with continuous-wave microwaves, which can be expected to produce even higher polarization than the corresponding pulsed techniques for electron spins greater than 1/2. The degree of nuclear polarization in this case can be easily monitored through the intensities of the well resolved hyperfine components in the EPR spectrum. The nuclear spin-lattice relaxation time is orders of magnitude longer than that of the electrons.
@article{arxiv.0805.4357,
title = {Dynamic nuclear polarization with simultaneous excitation of electronic and nuclear transitions},
author = {G. W. Morley and K. Porfyrakis and A. Ardavan and J. van Tol},
journal= {arXiv preprint arXiv:0805.4357},
year = {2008}
}