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The use of nitrogen-vacancy centers in diamond as a non-invasive platform for
hyperpolarizing nuclear spins in molecular samples is a promising area of
research with the potential to enhance the sensitivity of nuclear magnetic
resonance experiments. Transferring NV polarization out of the diamond
structure has been achieved on nanoscale targets using dynamical nuclear
polarization methods, but extending this to relevant NMR volumes poses
significant challenges. One major technical hurdle is the presence of
paramagnetic defects in the diamond surface which can interfere with
polarization outflow. However, these defects can also be harnessed as
intermediaries for the interaction between NVs and nuclear spins. We present a
method that benefits from existing microwave sequences, namely the PulsePol, to
transfer polarization efficiently and robustly using dangling bonds or other
localized electronic spins, with the potential to increase polarization rates
under realistic conditions.
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