CROSS-RELAXATION IN LASER-POLARIZED LIQUID XENON

By dissolving compounds in hyperpolarized liquid Xe, we have successfu lly transferred the Xe-129 polarization to other spins in solution. We have observed signal enhancements of over 45 for H-1, and over 70 for C-13, compared to their thermal polarization signals at 200 K and 1.4 T. The lifetimes of the enhancements are on the order of 20 min. In a ddition, in dissolved toluene we have seen preferential enhancement of the ring protons over the methyl protons. (C) 1998 Elsevier Science B .V.