Abstract
Two coadsorbed benzene/CO structures on Pd(111) and Rh(111) have been reanalyzed by automated tensor LEED. This computation permits the simultaneous optimization of many more atomic coordinates than before. The results show significant admolecule-induced substrate relaxations, the benzene causing an outward buckling and the CO causing a smaller inward buckling in the topmost metal layer. This analysis also confirms, on Rh(111), the likely presence of Kekulé distortions in the benzene carbon ring (i.e. alternating long and short CC bond lengths around the ring), with a sizable C-ring expansion. Together with improved scattering potentials, the R-factors are reduced by 44% and 28%, respectively. The clean surface structures were also re-examined in terms of multilayer relaxations, yielding a slight contraction of the topmost RhRh interlayer spacing, but a slight expansion for Pd.
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