Intermediate-Range Order in Water Ices

Details Intermediate-Range Order in Water Ices Intermediate-Range Order in Water Ices

2008-01-11

arxiv.org/abs/0801.1853v1

Physics

Condensed Matter

Materials Science

20 page, 4 figure. Submitted PRB

Scientific paper

We report measurements of the non-resonant inelastic x-ray scattering (NRIXS) from the O 1s orbitals in ice Ih, and also report calculations of the corresponding spectra for ice Ih and several other phases of water ice. We find that the intermediate-energy fine structure may be calculated well using an ab initio real-space full multiple scattering approach, and that it provides a strong fingerprint of the intermediate-range order for some ice phases. These results have important consequences for future NRIXS measurements of high-pressure phases of ice and also may call into question the assumption that the wavefunctions for final states within a few eV of the absorption edge are strongly localized.

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