Proton Diffusion in High Pressure Ice

• Published in: High pressure research Vol. 22; no. 1; pp. 9 - 11
• Main Authors: Aoki, K., Katoh, Eriko, Yamawaki, H., Fujihisa, H., Sakashita, M.
• Format: Journal Article
• Language: English
• Published: Taylor & Francis Group 2002
• Subjects: Diamond Anvil Cell; High Pressure Ice; Infrared Reflection Spectra; Proton Diffusion
• ISSN: 0895-7959; 1477-2299
• DOI: 10.1080/08957950211371

We have developed a spectroscopic method for measuring proton diffusion process in ice at high pressure and temperature using a diamond anvil cell (DAC). It enables us to determine the self diffusion constant of proton (deuteron) from infrared reflection spectra collected as a function of time for a H 2 O/D 2 O ice bilayer prepared and pressurized in the DAC. A preliminary experiment for ice VII at 14 GPa and 400 K provided a diffusion constant D=1.2\times1^{-15} m 2 /s. This was the first measurement of the proton diffusion in pure ice.