期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 122, 期 20, 页码 11159-11166出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.8b02783
关键词
-
资金
- Swiss National Science Fund [200021_149487]
We investigate the effects of high pressure on the reorientational and vibrational dynamics of methane molecules embedded in methane hydrate III-the stable form of methane for pressures above 2 GPa at room temperature-by combining highpressure Raman spectroscopy with ab initio simulations including nuclear quantum effects. We observe a clear evolution of the system from a gas-filled ice structure, where methane molecules occupy the channels of the ice skeleton and rotate almost freely, to a CH4:D(2)0 compound where methane rotations are hindered, and methane and water dynamics are tightly coupled. The gradual orientational ordering of the guest molecules results in a complete locking-in at approximately 20 GPa. This happens along with a progressive distortion of the guest molecules. Finally, as pressure increases beyond 20 GPa, the system enters a strong mode coupling regime where methane guests and water hosts dynamics are intimately paired.
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