LEED and XPS study of the oxygen-molecular beam induced reconstruction on Cu(111)

Moritani, Kosuke; Okada, Michio*; Teraoka, Yuden; Yoshigoe, Akitaka ; Kasai, Toshio*

We studied surface reconstruction of oxidized Cu single crystals with a hyperthermal oxygen molecular beam (HOMB). High-resolution X-ray photoemission spectroscopy (XPS) in conjunction with a synchrotron radiation (SR) source and low energy electron diffraction (LEED) were used for observation of the reconstruction. On Cu(111) surface, HOMB with the incident energy above 0.5eV induced a reconstruction like a (001) structure. On Cu(110) surface, the oxidation process depends on the azimuthal angle of incidence. Incidence through [100] direction and normal incidence showed an equivalent reaction rate. Incidence through [110] direction, however, made an reaction rate smaller compared with the normal incidence case. This indicates that the -Cu-O- added row structure has a role in inhibiting adsorption as a steric obstacle for incident O molecules.