title: Oxygen on an Fe monolayer on W(110): From chemisorption to oxidation.
abstract: The adsorption of oxygen on a pseudomorphic iron monolayer deposited on a W(110) surface was studied experimentally and theoretically. Standard surface characterization methods, such as Auger electron spectroscopy and low energy electron diffraction, and specific nuclear methods, such as conversion electron Mössbauer spectroscopy (CEMS) and nuclear resonant scattering of synchrotron radiation, combined with theoretical calculations based on the density functional theory allowed us to determine the structure of the oxygen adsorbate and the electronic properties of iron atoms with different oxygen coordinations. The oxygen-(3 × 2) structure on the iron monolayer was recognized and was interpreted to be a state with oxygen chemisorbed on the non-reconstructed surface with modest electron transfer from iron to oxygen. A transition from chemisorbed oxygen to the onset of Fe-oxidation is revealed by distinct changes in the CEMS spectra.
authors.affiliation: Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Kraków, Poland.
authors.forename: K
authors.initials: K
authors.lastname: Freindl
authors.affiliation: Faculty of Physics, University of Vienna, Strudlhofgasse 4, A-1090 Vienna, Austria.
authors.forename: E
authors.initials: E
authors.lastname: Partyka-Jankowska
authors.affiliation: Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland.
authors.forename: W
authors.initials: W
authors.lastname: Karaś
authors.affiliation: European Synchrotron Radiation Facility, BP220, F-38043 Grenoble, France ; Synchrotron Radiation Center SOLARIS, Jagiellonian University, ul. Gronostajowa 7/P-1.6, 30-387 Kraków, Poland.
authors.forename: M
authors.initials: M
authors.lastname: Zając
authors.affiliation: Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Kraków, Poland.
authors.forename: E
authors.initials: E
authors.lastname: Madej
authors.affiliation: Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Kraków, Poland.
authors.forename: N
authors.initials: N
authors.lastname: Spiridis
authors.affiliation: Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland.
authors.forename: M
authors.initials: M
authors.lastname: Slęzak
authors.affiliation: Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland.
authors.forename: T
authors.initials: T
authors.lastname: Slęzak
authors.affiliation: Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland.
authors.forename: D
authors.initials: D
authors.lastname: Wiśnios
authors.affiliation: Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, ul. Niezapominajek 8, 30-239 Kraków, Poland ; Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland.
authors.forename: J
authors.initials: J
authors.lastname: Korecki
keywords: Conversion electron Mössbauer spectroscopy; Density functional calculations; Electronic structure; Fe monolayer on W(110); Hyperfine interactions; Oxygen adsorption
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