Diamond NMR

The first bulk room-temperature NMR hyperpolarization of carbon-13 nuclei in diamond in situ at arbitrary magnetic fields and crystal orientations have been made by US researchers. The six percent boost to bulk nuclear spin polarization is equivalent to a signal enhancement of some 170,000 times over thermal equilibrium, Alexander Pines and colleagues report in the journal Nature Communications and arises through the effects of nitrogen vacancies in the diamond. "We envision highly enhanced NMR of liquids and solids using existing polarization transfer techniques, such as cross-polarization in solids and cross-relaxation in liquids, or direct dynamic nuclear polarization to outside nuclei from nitrogen-vacancy centers," team member Jonathan King explains.