Surface NMR Using Laser-Polarized129Xe under Magic Angle Spinning Conditions

NMR signals of surface nuclei of solids may be enhanced by the transfer of spin polarization from laser-polarized noble gases. Until now such experiments have not been feasible under conditions of magic angle spinning. In the present contribution it is shown that laser-polarized129Xe can be inserted into a spinning rotor under continuous-flow conditions using helium as a carrier gas. Effective adsorption of xenon on the sample occurs at temperatures of about 163–173 K making possible the observation of a spin polarization induced nuclear Overhauser effect (SPINOE) from the laser-polarized129Xe to surface1H nuclei of SiO2(AEROSIL300). This technique opens the way to selectively enhancedhigh-resolutionmultinuclear surface NMR experiments.