Reverse dynamic nuclear polarisation for indirect detection of nuclear spins close to unpaired electrons

Abstract. Polarisation transfer schemes and indirect detection are central to magnetic resonance. Using the trityl radical OX063 a pulse electron paramagnetic resonance spectrometer operating in Q-band (35 GHz, 1.2 T), we show here that it is possible use pulsed dynamic nuclear polarisation (DNP) from electrons protons back. The latter achieved by first saturating then simply using reverse DNP step. A variable mixing time between allows us investigate decay of on vicinity electrons. We qualitatively influence solvent deuteration, temperature, concentration. expect be useful investigation spin diffusion envisage its electron–nuclear double-resonance (ENDOR) experiments.