Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 43: Clean surfaces III

O 43.7: Vortrag

Mittwoch, 28. März 2012, 12:00–12:15, MA 043

Structure of V₂O₃ films on Au(111) — •Eric Meyer, Jan Seifert, and Helmut Winter — Humboldt-Universität zu Berlin, Institut für Physik, Newtonstr. 15, 12489 Berlin

In recent studies Window et al. [1] have reported on the surface termination of thin V₂O₃ films grown on Au(111). Measurements reveal a reconstructed trilayer with O₃-termination in accord with DFT-calculations. This is in conflict with a complete monolayer of vanadyl species found by other groups [2].

In this work we present studies on the V₂O₃ surface via scattering of fast atoms under grazing angles of incidence. The measurements are compared with trajectory computer simulations in which electron emission is incorporated for both structual models.

We find clear evidence for the reconstructed trilayer structure. Excellent agreement between experiment and simulation is found so that we can confirm a O₃ termination with slightly modified positions of topmost O atoms compared to [1].

[1] Window et al., Phys. Rev. Lett. 107, 016105 (2011)

[2] Dupuis et al., Surf. Sci. 539, 99 (2003)