Review Article

Raman Spectroscopy for Quantitative Analysis of Point Defects and Defect Clusters in Irradiated Graphite

Figure 18

A possible nucleation process of dislocation dipole by the reconstruction of di-vacancy. The left one transforms to two eightfold rings, sitting opposite to each other, and the right one to eightfold ring and two fivefold rings. If knock-on occurs at sites denoted by circles in (b), both of them can transform to the same structure consisting of eightfold, sevenfold, and fivefold rings as shown in (c).