| Polarized Raman spectroscopic study of relaxed high density amorphous ices under pressure. | |
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MedLine Citation:
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PMID: 21033806 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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We have made high density amorphous ice (HDA) by the pressure-induced amorphization of hexagonal ice at 77 K and measured the volume change on isobaric heating in a pressure range between 0.1 and 1.5 GPa. The volume of HDA on heating below ∼0.35 GPa increases, while the volume of HDA on heating above ∼0.35 GPa decreases. The polarized OH-stretching Raman spectra of the relaxed HDAs are compared with that of the unannealed HDA. The relaxed HDAs are prepared at 0.2 GPa at 130 K and 1.5 GPa at 160 K. It is found that the relatively strong totally symmetric OH-stretching vibration mode around 3100 cm(-1) exists in the depolarized reduced Raman spectrum χ(VH)(") of the unannealed HDA and that its intensity rapidly decreases by relaxation. The χ(VH)(") profiles of the relaxed HDA are similar to those of liquid water. These results indicate that the HDA reaches a nearly equilibrium state by annealing and the intrinsic state of HDA relates to a liquid state. The pressure-volume curve of the relaxed HDA at 140 K seems to be smooth in the pressure range below 1.5 GPa. |
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Authors:
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Yoshiharu Suzuki; Yasunori Tominaga |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of chemical physics Volume: 133 ISSN: 1089-7690 ISO Abbreviation: J Chem Phys Publication Date: 2010 Oct |
Date Detail:
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Created Date: 2010-11-01 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0375360 Medline TA: J Chem Phys Country: United States |
Other Details:
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Languages: eng Pagination: 164508 Citation Subset: - |
Affiliation:
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National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan. suzuki.yoshiharu@nims.go.jp |
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