The temperature-dependent probability of occupation of the two threefold-coordinated adsorption sites was determined for the system SjRu(0001) at a coverage of 0.33, analyzing energy-dependent intensity curves [I(E) curves] in low-energy electron diffraction of the ordered V3 x v 3R30' phase and of the disordered system. We show that this probability agrees fully with a lattice gas model containing a finite difference in adsorption energy between these sites.
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