First-Principles Study on Various Point Defects Formed by Hydrogen and Helium Atoms in Tungsten

Figure 8

Charge density distribution. (a), (b), and (c) show the single H atom and two H atoms located in octahedral sites; (d), (e), and (f) show the single He atom and two He atoms located in different octahedral sites. The red color represents high charge density, and the blue color represents low valence charge density.