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Hard repulsive barrier in hot adatom motion during dissociative adsorption of oxygen on Ag(100)
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View: Figures


Image of FIG. 1.
FIG. 1.

STM images of Ag(001) surface [(a) and (b)] with an O coverage of 0.6% ML; pairs are marked by ellipses (, ); image in (b) is split close to the step edge and different contrasts are chosen for the two terraces in order to make the atoms visible on both sides of the step edge (c) native substrate in atomic resolution, (, ) with ball model showing most stable adsorption site of an oxygen atom calculated in Ref. 4; white lines show lattice intervals (d) STM image of surface with an O coverage of 1.7% ML; superimposed atomic grid deduced from atomic resolution, (, ); crosses in (c) and (d) indicate fourfold hollow site H.

Image of FIG. 2.
FIG. 2.

(a) STM image of the Ag(001) surface with 1.7% ML coverage (, ). [(b)–(d)] Examples for the simulations with the same oxygen coverage as in (a). The black dots indicate oxygen atoms. Totally random simulations are shown in (b) without repulsion and in (c) with repulsion limiting the nearest neighbor distance to . RP simulation for pairs with distances of are shown in (d) without repulsion and (e) with a minimum nearest neighbor distance of . The white lines connect oxygen atom pairs. [(f)–(j)] Plot of the 2D pair distribution function within a radius of 3 nm with respect to each atom from (a)–(e). The distance between two pixels is 0.15 nm, about half a SLC, and the radius of small circle is 0.8 nm. [(k)–(o)] Histograms of the nearest neighbor distance from (a) to (e). Standard deviations for each case are labeled.

Image of FIG. 3.
FIG. 3.

Standard deviations of nearest-neighbor distances of RP simulation to STM results for different pairing distances: (a) for one pairing distance D (b) in dependence of ratio of 2 nm (±0.4 nm) to 4 nm (±0.4 nm) pairs.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hard repulsive barrier in hot adatom motion during dissociative adsorption of oxygen on Ag(100)