In situ Raman spectra of transformations of as functions of pressure and temperature have been measured starting from high-density amorphous ice (HDA). Changes above , the crystallization temperature of HDA, were observed. The spectra provide evidence for an abrupt, first-order-like, structural change that appears to be distinct from those associated with the transformation between low-density amorphous ice (LDA) and HDA. In separate experiments, in situ Raman spectra of ice XII transformed from HDA have been measured at various regions, in order to improve the understanding of the stability limits of ice XII. The spectra of ices VI and XII differ in shape, but the vibrational frequencies are very close in the same regimes. A metastable phase of ice found to form within the stability field of ice VI appears to be distinct from ice XII.
In situ Raman spectroscopy of low-temperature/high-pressure transformations of
Author to whom correspondence should be addressed. Present address: Department of Applied Chemistry, National Defense Academy, 1-10-20 Hashirimizu, Yokosuka, Kanagawa 239-8686, Japan. FAX: (+) 81 46 844 5901. Electronic mail: firstname.lastname@example.org
Yukihiro Yoshimura, Sarah T. Stewart, Ho-kwang Mao, Russell J. Hemley; In situ Raman spectroscopy of low-temperature/high-pressure transformations of . J. Chem. Phys. 7 May 2007; 126 (17): 174505. https://doi.org/10.1063/1.2720830
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