AFM Images (IMAGE)

Osaka University

AFM Images

Caption

(a−c) AFM images before (a) and after (b) KPFS manipulation of Oad2−−Oad2− with the tip positioned symmetrically in the middle and the corresponding line profiles (c). The double bright spot became a single one, indicating formation of an oxygen molecular species, O22−. (d−f) AFM images before (d) and after (e) KPFS manipulation of Oad2−−Oad2− with the tip positioned slightly off the middle position between the two atoms and the corresponding line profiles (f). (g−i) AFM images before (g) and after (h) KPFS manipulation of Oad2−−Oad2− with the tip positioned above one oxygen atom and the corresponding line profiles (i), indicating a change in the charge state from Oad2− to Oad − of only the oxygen atom that is under the tip. (j−m) DFT optimized structures are shown in each case: (j) Oad2−−Oad2−; (k) Oad2−−Oad−; (l) Oad−−Oad−; and (m) O22− adsorbed at the on-top Ti5c site. Note that there is also another adsorption site, the bridge site, see SI, section S9. Dashed horizontal lines depict the differences in heights of the oxygen adatoms. (A), (B), and (C) denote the three key manipulation scenarios, see text.

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Osaka University

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