The Temperature dependence of CuO formation on a Cu(110) surface with an energetic O molecular beam

エネルギーの大きな酸素分子線によるCu(110)表面におけるCuO形成の温度依存性

橋之口 道宏*; 吉越 章隆 ; 寺岡 有殿; 岡田 美智雄*

Hashinokuchi, Michihiro*; Yoshigoe, Akitaka; Teraoka, Yuden; Okada, Michio*

We report a study of the surface temperature (Ts) dependence of CuO formation on a Cu(110) surface induced by a hyperthermal O molecular beam (HOMB), using X-ray photoemission spectroscopy in conjunction with synchrotron radiation. From the Ts dependence of the O uptake curves, the direct dissociative adsorption process mainly contributes to the formation of the p(21)-O structure with an O coverage of 0.5 ML for 2.2 eV HOMB incidence. On the other hand, the rate of oxidation at the coverage larger than 0.5 ML, particularly in CuO formation, strongly depends on the Ts. Thicker CuO islands were found in homogeneously at 400 and 500 K, suggesting the dominant role of the migration of Cu atoms in the CuO formations on the Cu(110) surface.