(a) SiO2H2
(b) Si3O8H6
(c) SiO2H2
(d) Si3O8H6
Figure 7: (a)-(b) ELF of the divalent Si in -quartz cluster configurations with ODC(II). (c)-(d) Orbital wave function of HOMO in -quartz cluster configurations with ODC(II). Green and blue color represent positive and negative phase of the orbital wave function, respectively.