Figure 3From: From covalent bonding to coalescence of metallic nanorods Electron density distributions. At the initial stage (a) and at the saddle point (b) of diffusion for Al and at the initial stage (c) and at the saddle point (d) of diffusion for Cu. The cross sections show the directional distribution with the covalent bonding between atoms in Al and the spherical charge distribution about a centered ion in Cu.Back to article page