Abstract
The interaction of water with a platinum (111) surface has been examined by thermal desorption (TDS), ultraviolet photoemission (UPS), and X-ray photoemission (XPS) spectroscopies. UPS and XPS results indicate that water adsorbs molecularly at 100K. TDS studies show that water desorbs with approximately zero order kinetics and that a monolayer of water has a maximum desorption rate at 180 K. Heavier coverages exhibit additional desorption from multilayer water (ice) which peaks at temperatures near 165 K. The coadsorption of atomic oxygen with water leads to an increase in the desorption temperature of water of about 30 K. XPS studies of this surface indicate that adsorbed OH species are involved in the reaction mechanism which increases the water desorption temperature.
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