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寺岡 有殿; 吉越 章隆; 盛谷 浩右
真空, 47(4), p.301 - 307, 2004/04
Si(001)と酸素分子の高温における酸化反応の並進運動エネルギー効果について最近の研究成果を解説する。SiO分子の脱離収率の温度依存性,酸素の吸着曲線、及びシリコンの化学結合状態が並進運動エネルギーで変化することを述べる。酸化膜形成とSiO脱離が共存する化学反応過程に対する並進運動エネルギーの効果を議論する。
Syu, Y.*; 櫻井 惇也*; 寺岡 有殿; 吉越 章隆; 出村 雅彦*; 平野 敏幸*
no journal, ,
Intermetallic compounds (IMCs) usually have ordered crystal structure which differs from that of their constitute metals. Some of them have been reported to show good catalytic properties for some reactions, such as PtTi, NiSn, and NiAl, demonstrating that IMCs have potential as catalysts and/or catalyst precursors for chemical reactions. In this work, we investigate the initial oxidation process on a NiAl(210) surface at 298 K using a supersonic oxygen molecular beam and a real-time photoemission spectroscopy with synchrotron radiation. The time evolutions of O 1s, Ni 2p, Al 2p, and Ni 3p spectra indicate that both Al and Ni are oxidized, and AlO and NiO are formed during the irradiation of oxygen molecules. The oxidation rate of Al is much higher than that of Ni at the beginning of oxidation, and then quickly saturates. In contrast, the oxidation of Ni progresses gradually for the whole measured period.