Abstract
Xenon was forced into the a-cages of a Na-A zeolite at 40 bar and 525 K with up to 1.8 atoms per cage. After cooling to room temperature and releasing pressure, the lz9Xe NMR spectrum taken in air shows five peaks assigned to as many Xe atoms in the cages. Following exposure of the sample to water, the five peaks are replaced by a single one corresponding to a xenon-water clathrate. This work presents an additional application of xenon NMR toward the study of microporosity of solids.