The uniaxial rotation of ethylene adsorbed by sodium 13X zeolite

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Abstract
Measurements of quasi-elastic neutron scattering have enabled us to characterize the rotational and translational dynamics of an ethylene molecule adsorbed in sodium zeolite 13X. We find that a model for the scattering describing the motion in terms of 180° jump rotation about an axis perpendicular to the surface passing through the mid-point of the molecule satisfactorily explains the data. Uniaxial rotation about the other principal axes of the molecule is incompatible with our measurements. From this model we deduce that the molecule executes about 20 rotational jumps between each translation step.