Figure 4.

The calculated total valence charge density plots of a Ag reacted Si(111)-7 × 7 surface with Ag at the H3 site, b isolated Ag atom, c the difference charge density plot by subtracting Figs. 2a and 4b from Fig. 4a, and 4d the difference charge density plot with Ag at the S site on Si(111)-7 × 7. The area is 11.5 × 8 Å, and the contours interval is 0.1e Å−3 for Fig. 4a and 4b, and 0.02e Å−3 for Fig. 4c and 4d

Lin et al. Nanoscale Research Letters 2009 5:143-148   doi:10.1007/s11671-009-9456-x