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| - Atomic Resolution Imaging on CeO2(111) with Hydroxylated Probes
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| - The formation of atomic contrast on the stoichiometric CeO2(111) surface imaged by dynamic scanning forcemicroscopy (SFM) operated in the noncontact mode (NC-AFM) is investigated. We reproducibly obtain twostable contrast patterns, namely a pattern of hexagonally ordered disk-like features and a honeycomb typestructure. In series of measurements where we systematically vary the tip−surface distance, we find at alarge distance exclusively disk-like contrast while the honeycomb pattern occasionally appears at a smalltip−surface distance. We explain the contrast features within a model assuming that both types of contrastare created by the attractive interaction of first and third layer surface oxygen ions with the terminatingcluster of the tip. We propose a tip model involving single or vicinal hydroxyl groups at the apex of a siliconoxide tip. Within this model, the disk like contrast is produced by the most protruding hydroxyl group whilethe reversible change in contrast found for a small tip−surface distance is caused by its relaxation and possiblyfurther hydroxyl groups contributing to the tip sample interaction.
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