Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 34: Metal Substrates: Structure, Epitaxy and Growth
O 34.9: Poster
Dienstag, 17. März 2015, 18:15–21:00, Poster A
Oxygen interaction with Rhenium(10-10): A combined LEED and STM study — •Sebastian Schwede1, Jörg Lenz2, and Klaus Christmann1 — 1Inst. f. Chemie u. Biochemie FU Berlin — 2Mantis Deposition GmbH. Mainz
A previous LEED and ARUPS study on the interaction of oxygen with a Re(10-10) surface [1] revealed a series of ordered oxygen phases, among others a c(2x4), a (1x5), a (1x4), and a (1x3) saturation phase. We have reinvestigated this system by means of scanning tunneling microscopy and focused on the growth mechanism and the surface morphology of the O-induced structures. The c(2x4) phase with an oxygen coverage of 0.25 contains one O atom that is located in the hcp site of the unreconstructed Re unit mesh, while a massive oxygen-driven surface reconstruction sets in as the (1xn) phases form for O coverages > 0.5. The (1x3)-2O saturation structure at a coverage of 0.67 can best be explained on the basis of a double-missing row reconstruction as proposed in recent DFT calculations [2]. [1] J. Lenz et al., Surf. Sci. 269/270 (1992) 410 [2] P. Kaghazchi and T. Jacob, Phys. Rev. B81 (2010) 075431