MULTIPLE-QUANTUM FILTERED XE-131 NMR AS A SURFACE PROBE

It is shown how the interface between solid surfaces and cavities fill ed with gaseous Xe-131 can be probed by multiple-quantum filtered NMR. Physisorbed Xe-131 is usually not directly observable by NMR spectros copy, but information can be transferred into the gas phase through de sorption. The exchange process may lead to higher-rank order of the nu clear spins in gaseous xenon which can be detected by multiple-quantum filtered NMR.