Abstract
The motion of CH 4 molecules in the zeolites NaX and NaA has been studied by neutron time-of-flight experiments. Elastic peaks have been found, the intensity of which increases at decreasing scattering angle. The main features of the scattered neutron distributions are the same for different zeolite samples and various amounts of adsorbed methane. The observed neutron scattering law cannot satisfactorily be interpreted in terms of the current solid state models for the adsorbate dynamics. A computation of the neutron scattering law on the basis of a fluid phase model yields good agreement with the experiment.
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