Quasi-elastic neutron scattering study of benzene adsorbed in ZSM-5
- 1 January 1989
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 85 (8) , 2525-2534
- https://doi.org/10.1039/f19898502525
Abstract
The quasi-elastic neutron scattering of benzene adsorbed at two different loadings in H-ZSM-5 has been studied in the temperature range 90–400 K. The translational motion is too slow to be observed on the timescale of the experimental so that only the rotational motions can be characterized. The model of uniaxial rotation in an N-fold cosine potential is used to interpret the experimental data. On decreasing temperature, there is a progressive blocking of the molecules for both loadings but the amplitude of motion is more restricted at higher loading, at the same temperature, indicating benzene–benzene interactions. Isotropic spherical rotation is not observed, in agreement with n.m.r. results, and the C6 uniaxial rotation is as fast as in the liquid, with a correlation time τ= 3.2 × 10–12 s at 300 K.Keywords
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