Publication Type
Journal
Journal Name
Physical Review E
Publication Date
Page Number
051504
Volume
79
Issue
5
Abstract
Our quasielastic neutron scattering experiments and molecular dynamics simulations demonstrate that a sufficiently high hydration level is a prerequisite for the temperature-dependent dynamic crossover on the time scale of hundreds of picoseconds in the surface water on rutile (TiO2). Below the hydration level corresponding to the monolayer coverage of mobile surface water, a weak temperature dependence of the relaxation times with no apparent dynamic crossover is observed. We associate the dynamic crossover with inter-layer jumps of the mobile water molecules, which become possible only at a sufficiently high hydration level.
