title: Structure and formation mechanism of Ge E (') center from divalent defects in Ge-doped SiO2 glass
abstract: We have performed ab initio quantum-chemical calculations on clusters of atoms modeling a divalent Ge defect in Ge-doped SiO (2) glasses. It has been found that the divalent Ge defect interacts with a nearby GeO (4) tetrahedron, forming complex structural units that are responsible for the observed photoabsorption band at approximately 5 eV. We have shown that these structural units can be transformed into two equivalent Ge E' centers by way of the positively charged defect center.
authors.affiliation: Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.
authors.initials: T
authors.lastname: Uchino
authors.initials: M
authors.lastname: Takahashi
authors.initials: T
authors.lastname: Yoko