Sureface-temperature dependence of oxide formation on Cu(410) using a hyperthermal O molecular beam

Okada, Michio*; Vattuone, L.*; Moritani, Kosuke*; Gerbi, A.*; Savio, L.*; Yoshigoe, Akitaka ; Teraoka, Yuden; Rocca, M.*; Kasai, Toshio*

Initial oxidation processes at Cu(100) and Cu(410) surfaces by hyperthermal oxygen molecular beams (HOMB) have been investigated. In order to make clear effects of surface temperature, oxidation behaviour of steps at the Cu(410) surface, which had a moderate oxidation rate, was studied by high energy-resolution X-ray photoemission spectroscopy at the BL23SU in the SPring-8. Consequently, formation of CuO was observed at room temperature by using HOMB of about 2 eV. And metastable CuO was formed at 100 K. These facts indicate that interest surface layers can be formed by controlling incident energy of oxygen molecular beams and surface temperature.