Figure 5.

Simultaneously recorded (a) ES and (d) FS images of TiO₂(110) containing one single OH_b and one OH_b pair. (b–c) As (a), but recorded after the capping H atoms of the OH_b pair were removed sequentially using +2.6 V, 200 ms tip pulses. Solid circles mark the positions of single OH_b. Open circles mark the OH_b within the OH_b pair. Arrows indicate the capping H that was removed in each frame. (e–f) Corresponding FS images of (b–c), respectively. All images were recorded at 6.6 K. Image size: (4 × 4) nm². Scan parameters (V, I): (a–c) ±2 V, 30 pA; (d–f) −2 V, 1 pA. (g–h) Difference images formed by subtraction of the FS images obtained before and after the removal of each capping H within the OH_b pair.