2012 年 22 巻 2 号 p. 153-163
The present review introduces our recent studies of the title subjects that have led to the JSHPST Award for Young Scientists, 2011. We studied the structure, dynamics, and reactions in water under high-pressure and high-temperature conditions using NMR and computational methods. The NMR apparatus was newly developed and was applied for the self-diffusion measurements of water and nonpolar organic fluids over a wide range of pressure and temperature. Molecular dynamics simulation combined with a new analysis scheme provided new insights into the translational dynamics in the supercritical water in the medium-density region in relation to the structure and lifetime of the solvation shell.