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Report No.

Initial oxidation of copper alloy surfaces with a hyperthermal oxygen molecular beam

Tsuda, Yasutaka*; Makino, Takamasa*; Yoshida, Hikaru; Yoshigoe, Akitaka ; Fukuyama, Tetsuya*; Okada, Michio*

Initial stage of corrosion is one of the central topics in material science. In the present study, we report the results of oxidation on Cu$$_{3}$$Pd(111) and Cu$$_{3}$$Pt(111) with a hyperthermal O$$_{2}$$ molecular beam (HOMB) with variable incident energies, using X-ray photoemission spectroscopy in conjunction with synchrotron radiation. All experiments were performed using the Surface Reaction Analysis Apparatus constructed in BL23SU at SPring-8. The Cu$$_{3}$$Pd(111) and Cu$$_{3}$$Pt(111) samples were cleaned by Ar+ sputtering and annealing. The kinetic energy of the HOMB was set to be 2.3 eV. From the uptake curves, it was found that the oxidation of Cu$$_{3}$$Pt is less effective than that on Cu$$_{3}$$Au and Cu$$_{3}$$Pd. This suppression of the surface reactivity may be caused by the Pt-rich subsurface layer.



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