Hydrogen Clusters in Clathrate Hydrate
- 27 September 2002
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 297 (5590), 2247-2249
- https://doi.org/10.1126/science.1075394
Abstract
High-pressure Raman, infrared, x-ray, and neutron studies show that H 2 and H 2 O mixtures crystallize into the sII clathrate structure with an approximate H 2 /H 2 O molar ratio of 1:2. The clathrate cages are multiply occupied, with a cluster of two H 2 molecules in the small cage and four in the large cage. Substantial softening and splitting of hydrogen vibrons indicate increased intermolecular interactions. The quenched clathrate is stable up to 145 kelvin at ambient pressure. Retention of hydrogen at such high temperatures could help its condensation in planetary nebulae and may play a key role in the evolution of icy bodies.Keywords
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