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

超熱酸素分子ビームを用いた銅及び銅金表面酸化の比較研究

岡田 美智雄*; 盛谷 浩右; 福山 哲也*; 水谷 啓慶*; 吉越 章隆; 寺岡 有殿; 笠井 俊夫*

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

Cu$$_{3}$$Au(100)表面での超熱酸素分子ビームの解離吸着を放射光光電子分光で調べた。Cu$$_{3}$$Au表面での酸素吸着曲線をCuのそれと比較すると酸素分子の解離吸着がより活性障壁を持つ、すなわち、低反応性であることがわかった。低エネルギー電子線回折像(LEED)は清浄表面でC(2$$times$$2)であるが、超熱酸素分子ビームによる酸化によって1$$times$$1パターンに変化した。これは酸素の吸着で表面にCuが析出したためと解釈されている。

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(2$$times$$2) for the clean surface turned into the (1$$times$$1) LEED pattern during the oxidation by hyperthermal O$$_{2}$$ molecular beam, suggesting that the O adsorption induces the Cu-atom segregation on the surface.

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パーセンタイル:38.98

分野:Chemistry, Physical

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