Initial sticking rate of O molecular beams on Ni(111) surface dependending on kinetic energy

Ni(111)表面の超音速O分子線による初期吸着レートの運動エネルギー依存性

井上 敬介*; 寺岡 有殿

Inoue, Keisuke*; Teraoka, Yuden

In this study, the oxidation states of Ni(111) surface, made by irradiation of a supersonic O molecular beam (SSOMB), were analyzed using synchrotron radiation photoemission spectroscopy (SR-XPS). The surface temperature was 300 K during measurement. After irradiation of SSOMB on the Ni surface to some extent, the evolution of the surface oxides were observed by core level photoemission spectra of NiP and O1 so that oxygen uptake curves were measured at every translational energy of O beam. The initial sticking rate increased as translational energy increased from 0.06 eV to 1.0 eV, slightly decreased up to 2.2 eV, and a remarkable re-increase was observed in the region around 2.3 eV. These results imply that high speed O molecules adsorb via two potential barriers.