On the Relationships between Low-Density Amorphous Solid Water and Ice Ih
Abstract New experimental and theoretical studies of low-density amorphous solid water (H 2 O(as)) and of polycrystalline ice lh are reported and integrated with other available data. A variety of evidence is put forward to support the conclusion that low-density H 2 0(as) is derived from ice lh by...
| Published in: | Journal of Glaciology |
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| Main Authors: | , , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Cambridge University Press (CUP)
1978
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1017/s0022143000033657 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000033657 |
| Summary: | Abstract New experimental and theoretical studies of low-density amorphous solid water (H 2 O(as)) and of polycrystalline ice lh are reported and integrated with other available data. A variety of evidence is put forward to support the conclusion that low-density H 2 0(as) is derived from ice lh by slightly increasing the dispersion in the O—O separation and by introducing a distribution O—O—O angles (width c. 8°). Our theoretical analysis focusses attention on the consequences of strong intermolecular coupling of OH oscillators. The vibrational modes of both ice lh and H 2 0(as) are found to be complex mixtures of molecular motions, so the identification of regions of the Raman or infrared spectra of these materials with particular isolated molecule modes is not useful. The theory developed gives a good, but not perfect, account of the OH stretching regions of the observed Raman and infrared spectra of ice lh and, to a lesser degree of low-density H 2 0(as). |
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