Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 7: Metal Substrates: Adsorption I
O 7.2: Vortrag
Montag, 26. März 2007, 11:30–11:45, H39
Surface stress change during H-induced surface reconstruction on Ir(100) — •Zhen Tian1, Wei Pan2, Dirk Sander1, and Jürgen Kirschner1 — 1Max-Planck-Institut für Mikrostrukturphysik, — 2Department of Physics, National Chung Cheng University, Taiwan
Adsorption induced surface reconstructions are in some cases associated with a corresponding surface stress change [1]. In this work, we performed stress measurement during hydrogen exposure that induces structural reonstruction from Ir(100)-(5×1)hex to Ir(100)-(5×1)H surface[2]. We combine stress measurements by the crystal curvature technique with LEED experiments to investigate the correlation between the surface stress change and surface reconstruction. The change in surface stress is measured while introducing onto Ir(100)-(5×1)hex surface at room temperature. The surface stress starts to decrease once hydrogen is offered and gradually saturates when the amount of hydrogen reaches 4 langmuir. The total surface stress change is - 1.75 N/m. We find a linear relation between the surface stress change and the intensity ratio of LEED spots during the reconstruction, which suggests that the surface stress change is directly correlated with the structural transition.
[1] M. J. Harrison, D. P. Woodruff, and J. Robinson, D. Sander, W. Pan, and J. Kirschner, Phys. Rev. B 74, 165402 (2006).
[2] L. Hammer, W. Meier, A. Klein, P. Landfried, A. Schmidt and K. Heinz, Phys. Rev. Lett. 91, 156101 (2003).