Abstract
Neutron powder diffraction data of deuterated CO 2 clathrate hydrate were measured at 7, 48, 98, 148, and 213 K. Rietveld analysis revealed that the thermal parameters of the atoms of the CO 2 molecule in the tetrakaidecahedral cage are very large and almost constant in the whole temperature range. This result indicates that the CO 2 molecule in the tetrakaidecahedral cage rotates rapidly even at low temperatures. The interaction between the CO 2 molecule and the deuterium atoms is so strong to provide the site dependence of the thermal parameters of the deuterium atoms.
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