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Journal Articles

Comparative study of oxidation on Cu and Cu $_{3}$ Au surfaces with a hyperthermal O $_{2}$ molecular beam

Okada, Michio*; Moritani, Kosuke; Fukuyama, Tetsuya*; Mizutani, Hironori*; Yoshigoe, Akitaka; Teraoka, Yuden; Kasai, Toshio*

Surface Science, 600(18), p.4228 - 4232, 2006/09

https://doi.org/10.1016/j.susc.2006.01.149

Times Cited Count：20 Percentile：64.39(Chemistry, Physical)

Dissociative adsorption of hyperthermal O $_{2}$ molecules on Cu $_{3}$ Au(100) was investigated by X-ray photoemission spectroscopy in conjunction with a synchrotron light source. Comparing the O-uptake curve on Cu $_{3}$ Au with that on Cu, it was found that the dissociative adsorption of O $_{2}$ is more activated (less reactive) due to Au alloying. The low-energy electron-diffraction (LEED) pattern of c(22) for the clean surface turned into the (11) LEED pattern during the oxidation by hyperthermal O $_{2}$ molecular beam, suggesting that the O adsorption induces the Cu-atom segregation on the surface.

Journal Articles

Photoemission study of the translational energy induced oxidation processes on Cu(111)

Moritani, Kosuke; Okada, Michio*; Sato, Seiichi*; Goto, Seishiro*; Kasai, Toshio*; Yoshigoe, Akitaka; Teraoka, Yuden

Journal of Vacuum Science and Technology A, 22(4), p.1625 - 1630, 2004/08

https://doi.org/10.1116/1.1743254

Times Cited Count：25 Percentile：65.99(Materials Science, Coatings & Films)

We studied the oxidation of Cu{111} surface with a hyperthermal O $_{2}$ molecular beam (HOMB) using X-ray photoemission spectroscopy (XPS) in conjunction with a synchrotron radiation (SR) source. The efficiency of oxidation with 0.6-eV-HOMB is higher thab that with 2.3-eV-HOMB under 0.5ML. Ont the other hand, further oxidation occurs rather inefficiency under 0.5ML. In this region, efficiency of oxidation with 2.3-eV-HOMB is higher than 0.6-eV-HOMB. We found that such slow oxidation process of Cu can be interpreted in terms of a collision-induced-adsorption mechanism. These results suggest that we can control the oxidation process of Cu by using HOMB.