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- W2024076513 abstract "The kinetic energy distributions and yield-time dependence of electronically desorbed O+ have been examined from clean Rh(111) and CO covered Rh(111). For the clean Rh(111) surface, we observe up to three peaks in the electron-stimulated desorption (ESD) O+ kinetic energy distributions dependent on the amount of CO adsorbed and the thermal history of the surface. The highest energy O+ peak appears at ∼ 8.0 eV and is present in the kinetic energy spectra only when CO is adsorbed on the surface. The intermediate energy O+ peak at ∼ 3.5 eV appears only after CO exposures greater than ∼ 1.0 L and requires extended electron irradiation. The lowest energy peak at ∼ 1.5 eV is present only after the sample has been annealed to T > 1200 K and can be seen regardless of whether the Rh(111) surface has been exposed to CO. The intensities of both low energy peaks were electron beam dose dependent, indicating that the surface states detected were most likely electron beam induced. The high energy O+ kinetic energy distribution peak was apparently due to CO adsorbed in both atop and bridge adsorption sites. The low energy O+ kinetic energy distribution peak is thought to be due to electron-stimulated dissociation of adsorbed CO, which is supported by the similar behavior observed for the OH+ kinetic energy distributions. Finally, the lowest energy O+ kinetic energy distribution peak, which was present only after cleaning and annealing the Rh(111) crystal, may have been due to the presence of residual oxygen left over following the cleaning procedure." @default.
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- W2024076513 date "1994-04-01" @default.
- W2024076513 modified "2023-09-26" @default.
- W2024076513 title "Electron-stimulated desorption of O+ and OH+ from CO covered Rh(111)" @default.
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- W2024076513 doi "https://doi.org/10.1016/0039-6028(94)91198-3" @default.
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