Abstract
Raman data for ice VII to 30 GPa and x-ray lattice parameters to 36 GPa, all at room temperature, are presented and discussed. Both the Raman OH-stretching peak frequency (Δv̄) and the edge distance of the body-centered cubic unit cell (a) decrease at a decreasing rate with pressure rise. The OH peak frequency is found to be virtually linear in the nearest-neighbor O–O distance (rOO) between about 2.5 and 2.9 Å. However, the data can also be fitted with a slight cubic dependence, which when extrapolated, gives rise to a minimum in Δv̄ at rOO=2.35±0.06 Å. This is close to the value of 2.4 Å found for the symmetric O–H–O units in other materials. This minimum suggests, but does not prove, that a symmetric hydrogen bond structure O–H–O, and thus a new ice, may result at pressures of about 75±20 GPa. Treatment of the O–H⋅⋅⋅O units according to couplet oscillators using experimentally confirmed assumptions indicates that Δv̄≊A/rOH2 which when combined with present and previously published data yields, approximately, A≊2943 cm−1 Å2. Thus, the decrease observed in Δv̄ is thought to occur because the OH bond length (rOH) increases with increasing pressure as the O–O distance rOO in the corresponding hydrogen-bonded O–H⋅⋅⋅O unit decreases.
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Dates
Type | When |
---|---|
Created | 22 years, 5 months ago (Feb. 28, 2003, 11:32 a.m.) |
Deposited | 1 year, 6 months ago (Feb. 9, 2024, 7:04 p.m.) |
Indexed | 1 month, 2 weeks ago (July 4, 2025, 9:03 a.m.) |
Issued | 43 years ago (Aug. 15, 1982) |
Published | 43 years ago (Aug. 15, 1982) |
Published Print | 43 years ago (Aug. 15, 1982) |
@article{Walrafen_1982, title={Raman and x-ray investigations of ice VII to 36.0 GPa}, volume={77}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.444023}, DOI={10.1063/1.444023}, number={4}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Walrafen, G. E. and Abebe, M. and Mauer, F. A. and Block, S. and Piermarini, G. J. and Munro, R.}, year={1982}, month=aug, pages={2166–2174} }