title: Oxygen K-edge fine structures of water by x-ray Raman scattering spectroscopy under pressure conditions.
abstract: Fine structure of the oxygen K edge was investigated for water at ambient pressure, 0.16, 0.21, 0.27, 0.47, and 0.60 GPa using x-ray Raman scattering spectroscopy (XRS). Similarity in near-edge structures at 0.16 and 0.60 GPa suggests little difference in the electronic state of oxygen in the low-pressure and high-pressure forms of water. Yet, we observed significant variation of preedge structure of the XRS spectra with compression. The intensity of the preedge peak at 535.7 eV has a minimal value at around 0.3 GPa, indicating that the number of hydrogen bonding increases first and then decreases as a function of pressure.
authors.affiliation: Institute for Study of the Earth's Interior, Okayama University, Misasa, Tottori 682-0193, Japan. fukuih@misasa.okayama-u.ac.jp
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Fukui
authors.forename: Simo
authors.initials: S
authors.lastname: Huotari
authors.forename: Denis
authors.initials: D
authors.lastname: Andrault
authors.forename: Tatsuhiko
authors.initials: T
authors.lastname: Kawamoto