Fig. 3
From: Maximising the resolving power of the scanning tunneling microscope
STM images and detailed analysis of the (2 × 2) honeycomb Ti2O3 ultrathin film on Au(111). a Raw STM image of the honeycomb structure (image width 4.2 nm, Vs = 1.0 V, It = 0.22). b Average of 528 tiles (image widths 4.2 nm, Vs = 1.0 V, It = 0.22–0.25 nA). The SNR is significantly improved and scan-distortions are corrected. Individual Ti atoms can be distinguished and are marked as A and B. c The same data as in b but with an exaggerated colour scale to highlight the small differences in peak height between A and B sites. d Line-profile from the raw and processed images from the dashed white line shown in b. The profiles are offset by 40 pm from each other for clarity. e Enlargement from d showing the 1.32 pm difference in height of the A and B sites. f Histogram of the height difference measured from 42 A–B pairs. g Model for the bare Au(111) surface (left part of figure) with hcp (yellow), fcc (orange), and top (grey) sites indicated. Ti atoms located on the fcc and hcp sites are in dark and light blue, respectively (centre of figure). O atoms are shown in red (right part of figure)