Title: Cascading Fermi Resonances and the Soft Mode in Dense Ice
Abstract:Synchrotron infrared reflectance and absorbance spectroscopy reveals a cascading sequence of pressure-induced Fermi resonances in compressed ${\mathrm{H}}_{2}\mathrm{O}$ and ${\mathrm{D}}_{2}\mathrm{O...Synchrotron infrared reflectance and absorbance spectroscopy reveals a cascading sequence of pressure-induced Fermi resonances in compressed ${\mathrm{H}}_{2}\mathrm{O}$ and ${\mathrm{D}}_{2}\mathrm{O}$ ices up to and through the transition to the symmetric hydrogen-bonded phase. These resonances arise from the extremely large pressure shift of the O-H(D) stretching mode associated with the transition, which causes multiple avoided crossings between this and other infrared-active vibrational states. The highest frequency LO mode has a minimum at the transition, and the LO-TO splitting increases dramatically in the high-pressure phase. Fano-like features are present in absorbance even in the absence of mode coupling.Read More
Publication Year: 1997
Publication Date: 1997-06-09
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 98
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