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

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

doi:10.1016/0009-2614(96)00583-0

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 journal › Article › Academic › peer-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 I^c and VII. The pressure dependence of both the v_O-H frequency and the intermolecular distance d_O-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 v_O-H and d_O-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 language	English
Pages (from-to)	524-530
Number of pages	7
Journal	Chemical physics letters
Volume	257
Issue number	5-6
DOIs	https://doi.org/10.1016/0009-2614(96)00583-0
Publication status	Published - 2 Aug 1996
Externally published	Yes

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title = "Pressure dependence of hydrogen bonding in a novel H2O-H2 clathrate",

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.",

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AU - Vos, Willem L.

AU - Finger, Larry W.

AU - Hemley, Russell J.

AU - Mao, Ho Kwang

PY - 1996/8/2

Y1 - 1996/8/2

N2 - 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.

AB - 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.

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DO - 10.1016/0009-2614(96)00583-0

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

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