Determination by neutron spectroscopy of the external frequencies of a CH4 molecule adsorbed in an NaA zeolite cavity
- 1 January 1990
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 86 (10) , 1905-1907
- https://doi.org/10.1039/ft9908601905
Abstract
The external vibration frequencies of a CH4 molecule inside an NaA zeolite cavity have been measured by neutron spectroscopy. The experiments were carried out at 4, 10, 60 and 150 K. At 4 K two broad peaks were found, centred at 69 and 178 cm–1. Comparison between experiments and calculation on the CH4–NaA system suggests that the low-frequency peak corresponds to the external vibrations in the adsorption site. The 178 cm–1 peak must be attributed to the libration of the trapped molecule.Keywords
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