The oxidation state of Fe(100) after initial oxidation in O2

2019-11-01 06:51:51

layer Fe oxidation 100 oxide

责任者: Roosendaal, S.J.;van Asselen, B.;Elsenaar, J.W.;Vredenberg, A.M.;Habraken, F.H.P.M. 单位: Debye Inst., Utrecht Univ., Netherlands 来源出处: Surface Science(Surf. Sci. (Netherlands)),1999/12/01,442(3):329-37 摘要: Using a combination of quantitative X-ray photoelectron spectroscopy (XPS) with the high energy ion beam technique elastic recoil detection (ERD), we focus on the chemical state of thin (a few nanometers) oxide films on Fe(100). We determined quantitatively the amounts of Fe2+ and Fe3+ in the oxide layer formed at room temperature and compared these with the absolute coverages of oxygen determined with ERD. For thin oxide layers (⩽4.0×1015 O atoms/cm2 corresponding to 3 ML), the oxide layer grown on Fe(100) consists of Fe2+ mainly, indicating the growth of FeO. Some Fe0 also seems to be present in the oxide layer. For larger coverages additional Fe atoms in the oxide are in the 3+ state, which is present mainly near the oxide/vacuum interface. Annealing of the double layer system formed or oxidizing at higher temperature leads to an increase of the relative amount of Fe2+ 关键词: annealing;ESCA;iron;oxidation;particle backscattering;X-ray photoelectron spectra;Fe(100);initial oxidation;oxidation state;quantitative XPS;high energy ion elastic recoil detection;thin oxide layers;annealing;Fe