ausblenden:
Schlagwörter:
scanning tunnelling microscopy; adsorbed layers; island structure; fluctuations; oxygen; ruthenium; density functional theory; Monte Carlo methods; surface reconstruction; 3-body interactions; phase-diagram; O/Ru(0001); W(110); adsorption; system; layers; pair
Zusammenfassung:
Equilibrium fluctuations of islands of adsorbed O atoms on Ru(0001) were investigated by scanning tunneling microscopy (STM), density functional theory calculations (DFT) and Monte Carlo (MC) simulations. Very ramified (2x2)-O islands were observed by high-speed STM that point to complex interactions between the O atoms. The DFT calculations show that, in addition to pairwise attractive interactions between third-nearest neighbors, a repulsive three-body interaction exists between these. MC simulations that include three-body interactions reproduce the observed ordering behavior.
