Pressure dependence of hydrogen bonding in a novel H2O-H2 clathrate

Willem L. Vos*, Larry W. Finger, Russell J. Hemley, Ho Kwang Mao

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

We have carried out Raman spectroscopy and X-ray diffraction to 60 GPa of the 1: 1 H2O: H2 clathrate hydrate, which has water molecules in an arrangement similar to pure ices Ic and VII. The pressure dependence of both the vO-H frequency and the intermolecular distance dO-H...O is significantly larger than in pure ice: unexpectedly, both dependencies can be mapped onto those of pure ice by doubling the pressure. Nevertheless, the correlation between vO-H and dO-H...O is the same as in pure ice, making the clathrate a model system for ice at pressures reduced by a factor 2. Thus, the transition to a phase with symmetric hydrogen bonds probably occurs in the range 30-40 GPa, which is significantly lower than that for H2O.

Original languageEnglish
Pages (from-to)524-530
Number of pages7
JournalChemical physics letters
Volume257
Issue number5-6
DOIs
Publication statusPublished - 2 Aug 1996
Externally publishedYes

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