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. 2014 Sep 1;10:2055–2064. doi: 10.3762/bjoc.10.213

Figure 4.

Figure 4

Different STM images of PTCDA on the (√2 × 2√2)R45° – 2O/Cu(100) surface. (a) STM image of a terrace, which is fully covered by PTCDA. The terrace is limited by an ascending and a descending step in the upper and lower parts of the image, respectively (Ubias = −3.0 V, IT = 49 pA, 38.8 × 35.0 nm2). (b) Image of the ordered incommensurate structure of PTCDA on this surface (Ubias = −1.6 V, IT = 59 pA, 8.0 × 8.0 nm2). (c) High resolution image of the ordered structure showing submolecular resolution (Ubias = 1.2 V, IT = 84 pA, 3.1 × 3.1 nm2). (d) Hardsphere model for the incommensurate structure of PTCDA on (√2 × 2√2)R45° – 2O/Cu(100). The unit cell of the 2O/Cu(100) surface is drawn in the right lower corner. In order to reduce the complexity only the topmost layer of one domain of the (√2 × 2√2)R45° – 2O superstructure is drawn. The same color code as in Figure 3 applies.