| AVS 55th International Symposium & Exhibition | |
| Surface Science | Thursday Sessions |
| Session SS-ThP |
| Session: | Poster Session |
| Presenter: | S. Kaya, Stanford Synchrotron Radiation Laboratory |
| Authors: | S. Kaya, Stanford Synchrotron Radiation Laboratory S. Yamamoto, Stanford Synchrotron Radiation Laboratory J.T. Newberg, Lawrence Berkeley National Laboratory H. Bluhm, Lawrence Berkeley National Laboratory A.R. Nilsson, Stanford Synchrotron Radiation Laboratory |
| Correspondent: | Click to Email |
Aggregation of water and ice nucleation on ionic surfaces have been a topic of interest for many years due to their importance in atmospheric and environmental chemistry. However, the fundamental questions such as the structure and chemical composition of thin film water on surfaces in equilibrium with ambient pressure water vapor are still largely unanswered. BaF2(111) is one of the promising model substrates at which two dimensional hexagonal ice growth can be expected due to their matching lattice parameters. By using ambient pressure photoemission spectroscopy (APPES) and O K‐edge near-edge x-ray absorption fine structure (NEXAFS) spectroscopy, we have studied the interaction of water with the BaF2(111) surface at water partial pressures up to 1.5 Torr. Water uptake curves indicate that monolayer coverage is achieved at relative humidities lower than 10 %. O K‐edge NEXAFS findings reveal that the structure of submonolayer water on the BaF2(111) surface is similar to the topmost surface of hexagonal ice which is lacking two dimensional long range order. Additional water layers obtained at higher relative humidities have slightly different hydrogen bonding structures. In addition, lateral hydrogen bonding network becomes more apparent with increasing water coverage.