Neutron time-of-flight experiments were done with ethanol in natural chabazite crystals and, for comparison, with ethanol in the liquid and the gaseous state. The neutron data from the adsorbate at 440K temperature were more similar to those from the liquid at ambient temperature than to those from the vapor at 433K. The observed shape of the quasi-elastic peaks from the adsorbate corresponded to a mean center-of-mass amplitude of u = 0.05nm, a diffusion constant D = 3 x 10-11m2/s, an effective radius of rotational motions R = 0.1nm and an orientational residence time of τ = 8ps.

Ethanol in Chabazite at Temperatures between 300 and 440K Studied by Neutron Time-of-Flight Spectroscopy. R.Stockmeyer: Physica B, 1997, 234-236, 917-8