title: Hydrogen bonding, H-D exchange, and molecular mobility in thin water films on TiO2(110).
abstract: Hydrogen bonding, H-D exchange, and molecular mixing in water films on TiO2(110) have been studied using water electron-stimulated desorption. For T<70 K, films with different water isotopes adsorbed on the Ti4+ and bridging oxygen rows can be prepared. For T>70 K, H-D and molecular exchange between these "layers" occur with a distribution of activation energies and is surprisingly efficient. The results demonstrate that all the water molecules that are directly bound to TiO2(110) -- i.e., in the first and second monolayers -- are also hydrogen bonded to each other.
authors.affiliation: Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352, USA.
authors.forename: Nikolay G
authors.initials: NG
authors.lastname: Petrik
authors.forename: Greg A
authors.initials: GA
authors.lastname: Kimmel