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- W2003172029 abstract "Ultrathin films of barium oxide were grown on Ag(001) and Ag(111) using the evaporation of Ba metal in an O2 atmosphere by molecular beam epitaxy. Ultraviolet photoemission spectroscopy reveals that films consisting of predominantly BaO or BaO2 result in Ag(001) work function reductions of 1.74 eV and 0.64 eV, respectively. On the Ag(001) surface, Ba oxide growth is initiated by two-dimensional nucleation of epitaxial BaO, followed by a transition to three-dimensional dual-phase nucleation of epitaxial BaO and BaO2. Three-dimensional islands of primarily BaO2(111) nucleate epitaxially on the Ag(111) substrate leaving large patches of Ag uncovered. We find no indication of chemical reaction or charge transfer between the films and the Ag substrates. These data suggest that the origin of the observed work function reduction is largely due to a combination of BaO surface relaxation and an electrostatic compressive effect." @default.
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- W2003172029 date "2015-02-01" @default.
- W2003172029 modified "2023-10-12" @default.
- W2003172029 title "Work function reduction by BaO: Growth of crystalline barium oxide on Ag(001) and Ag(111) surfaces" @default.
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- W2003172029 doi "https://doi.org/10.1016/j.susc.2014.07.010" @default.
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