Abstract
Oxygen adsorption on the (1×2) missing row reconstructed Rh(110) surface has been studied by means of low-energy electron diffraction (LEED), x-ray photoelectron spectroscopy (XPS), and scanning tunneling microscopy (STM). Starting from the already known (2×2)p2mg oxygen overlayer in which the substrate is (1×2) reconstructed, further oxygen has been dosed at room and lower temperatures. Upon heating, additional substrate reconstruction takes place and the surface forms a new structure with (10×2) periodicity and high local oxygen coverage. Oxygen 1s XPS measurements show a binding energy shift from 530.25 eV in the (2×2)p2mg to 529.75 eV in the (10×2) layer. Analysis of STM images reveals that in the (10×2) layer, the rhodium close-packed rows are strained and segmented in the [11̄0] direction. On the basis of the experimental results, models for the (10×2) structure and its formation process are proposed and compared with “pseudo-oxide” structures.
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