Surface Relaxation ofHe3on Small Fluorocarbon Particles

The nuclear magnetic polarization of ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ on the surface of a fluorocarbon substrate is controlled by the polarization of the ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}$ in the substrate. The apparent relaxation rates of the ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ measure the coupling between the spin baths of the ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ and the ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}$ nuclei within the substrate.