Hydrogen bonding, H-D exchange, and molecular mobility in thin water films on TiO2(110).
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.
Petrik
Nikolay G
NG
Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352, USA.
Kimmel
Greg A
GA