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Unusual disordering processes of oxygen overlayers on Rh(111): A combined diffraction study using thermal He atoms and low-energy electrons

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Over,  Herbert
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Schwegmann,  Stefan
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Over, H., Schwegmann, S., Cvetko, D., De Renzi, V., Floreano, L., Gotter, R., et al. (1997). Unusual disordering processes of oxygen overlayers on Rh(111): A combined diffraction study using thermal He atoms and low-energy electrons. Physical Review B, 55(7), 4717-4722. doi:10.1103/PhysRevB.55.4717.


Cite as: https://hdl.handle.net/21.11116/0000-0008-B49E-B
Abstract
The temperature-dependent behavior of the Rh(111)-(2X2)-1O phase was investigated by He-atom scattering
(HAS) and low-energy electron diffraction. The adsorption system undergoes an order-disorder phase transition at Tc=280±5 K, with critical exponents found to be consistent with the four-state Potts model. Beyond the phase transition the HAS specular peak intensity exhibits a strong and reversible increase. This finding points toward a reduction of the surface charge-density corrugation induced by the phase transition itself. Around 160 K, hydrogen adsorbed on the Rh(111)-(2X2)-1O surface reacts with oxygen to form water, and drives the overlayer in an out-of-equilibrium condition which is characterized by a dramatic domain-wall
proliferation.