X-ray photoemission spectroscopy study of UV/ozone oxidation of Au under ultrahigh vacuum conditions

• DOI: 10.1116/1.580924
• Publication Date: 2002-07-27T09:06:02Z
• Authors: Anatol Krozer; Michael Rodahl
• Keywords: Chemisorption; Stoichiometry; Isothermal process

(111) textured Au films were oxidized under UHV conditions by exposing them to UV radiation and ozone. The characterized x-ray photoelectron spectroscopy. gold surface becomes heterogeneous upon oxidation: approximately 0.8 monolayer (ML) of the adsorbed oxygen is present as chemisorbed species. rest forms, on average, a few ML thick oxide with stoichiometry close Au2O3. Both disappear slowly when heated 150 °C. During isothermal decomposition at 200 °C, transformed prior desorption. can be removed rinsing water. hydrophilic after rinse. When contaminated are exposed UV/ozone, impurity oxides appear higher binding energies than clean samples. thermally much more stable