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  • 1.
    Soldemo, Markus
    et al.
    KTH.
    Halldin Stenlid, Joakim
    KTH.
    Besharat, Zahra
    KTH.
    Ghadami Yazdi, Milad
    KTH, Materialfysik, MF.
    Önsten, Anneli
    KTH.
    Leygraf, Christofer
    KTH.
    Göthelid, Mats
    KTH, Materialfysik, MF.
    Brinck, Tore
    KTH.
    Weissenrieder, Jonas
    KTH.
    The Surface Structure of Cu2O(100)2016In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 120, no 8, p. 4373-4381Article in journal (Refereed)
    Abstract [en]

    Despite the industrial importance of copper oxides, the nature of the (100) surface of Cu2O has remained poorly understood. The surface has previously been subject to several theoretical and experimental studies, but has until now not been investigated by atomically resolved microscopy or high-resolution photoelectron spectroscopy. Here we determine the atomic structure and electronic properties of Cu2O(100) by a combination of multiple experimental techniques and simulations within the framework of density functional theory (DFT). Low-energy electron diffraction (LEED) and scanning tunneling microscopy (STM) characterized the three ordered surface structures found. From DFT calculations, the structures are found to be energetically ordered as (3,0;1,1), c(2 x 2), and (1 x 1) under ultrahigh vacuum conditions. Increased oxygen pressures induce the formation of an oxygen terminated (1 x 1) surface structure. The most common termination of Cu2O(100) has previously been described by a (3 root 2 x root 2)R45 degrees unit cell exhibiting a LEED pattern with several missing spots. Through atomically resolved STM, we show that this structure instead is described by the matrix (3,0;1,1). Both simulated STM images and calculated photoemission core level shifts compare favorably with the experimental results.

  • 2.
    Soldemo, Markus
    et al.
    KTH.
    Lundgren, Edvin
    Lund University.
    Weissenrieder, Jonas
    KTH.
    Oxidation of Fe(110) in oxygen gas at 400 °c2016In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 644, p. 172-179Article in journal (Refereed)
    Abstract [en]

    The initial oxidation of Fe(110) in oxygen gas at 400 °C beyond initial adsorbate structures has been studied using X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, low-energy electron diffraction, and scanning tunneling microscopy (STM). Formation of several ordered phases of surface oxides is observed at oxygen coverages between approximately 2.3 and 3.5 oxygen atoms/Fe(110) surface atom. Initially, a FeO(111)-like film is formed with a parallelogram-shaped moiré pattern. It has two mirror domains that are formed symmetrically around the growth direction of a zigzag-shaped adsorbate structure. With increased local oxygen coverage, the moiré structure transforms into a ball-shaped form. Both these moiré structures have equal atomic stacking at the surface and equal apparent height in STM, suggesting oxygen ions diffusing into the film upon oxidation and that the oxide growth takes place at the iron-iron oxide interface. The FeO(111)-like film turns into a Fe3O4(111)-like film with a triangular bistable surface termination as the oxidation proceeds further. The FeO(111)-like film growth proceeds according to the Frank-van der Merwe mechanism while the Fe3O4(111)-like film grows according to the Stranski-Krastanov mechanism.

  • 3.
    Stenklo, Katarina
    et al.
    Karlstad University, Division for Chemistry.
    Danielsson Thorell, Helena
    Karlstad University, Division for Chemistry.
    Bergius, Helena
    Karlstad University, Division for Chemistry.
    Aasa, Roland
    Department of Molecular Biotechnology, Chalmers University of Technology, Lundberg Laboratory.
    Nilsson, Thomas
    Karlstad University, Division for Chemistry.
    Chlorite dismutase from Ideonella dechloratans2001In: Journal of Biological Inorganic Chemistry, ISSN 0949-8257, E-ISSN 1432-1327, J Biol Inorg Chem 2001 June;5 (5-6):601-7, Vol. 6, no 5-6, p. 601-607Article in journal (Refereed)
    Abstract [en]

    Chlorite dismutase has been purified from the chlorate-metabolizing bacterium Ideonella dechloratans. The purified enzyme is tetrameric, with a relative molecular mass of 25,000 for the subunit, and contains about 0.6 heme/subunit as isolated. Its catalytic properties are similar, but not identical, to those found for a similar enzyme purified earlier from the bacterium GR-1. The heme group in Ideonella chlorite dismutase is readily reduced by dithionite, in contrast to the GR-1 enzyme, and redox titration gave a value of -21 mV for the midpoint potential at pH 7. The heme group has been characterized by optical and EPR spectroscopy. It is high-spin ferric at neutral pH, with spectroscopic properties similar to those found for cytochrome c peroxidase. In the alkaline pH range, a low-spin compound is formed. A 22-residue N-terminal amino acid sequence has been determined and no homologue has been found in the protein sequence databases.

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