Ya. Shpotyuk, A. Ingram, J. Filipecki, and M. Hyla.
Physica Status Solidi C, vol. 8, No. 11–12, 2011, p. 3163–3166.
Instability effects caused by high-energy γ-irradiation are studied in (As2S3)1-x(Sb2S3)x glasses (x=0, 0.1, 0.2 and 0.3) using positron annihilation lifetime spectroscopy, the results being treated within two-state trapping model in both normal and high-measurement statistics. The observed decrease in positron trapping rate of the glasses tested just after γ-irradiation was explained due to renovation of destroyed covalent chemical bonds. This process was governed by monomolecular single-exponential relaxation kinetics agreed well with corresponding changes in the fundamental optical absorption edge.